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   * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
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   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
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   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
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   * You should have received a copy of the GNU General Public License version
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   *
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  /*
   * This file is available under and governed by the GNU General Public
   * License version 2 only, as published by the Free Software Foundation.
   * However, the following notice accompanied the original version of this
   * file:
   *
   * Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos
   *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   *  * Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   *
   *  * Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
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   *  * Neither the name of JSR-310 nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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   * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  package java.time;
  
  import static java.time.temporal.ChronoField.EPOCH_DAY;
  import static java.time.temporal.ChronoField.INSTANT_SECONDS;
  import static java.time.temporal.ChronoField.NANO_OF_DAY;
  import static java.time.temporal.ChronoField.OFFSET_SECONDS;
  import static java.time.temporal.ChronoUnit.FOREVER;
  import static java.time.temporal.ChronoUnit.NANOS;
  
  import java.io.IOException;
  import java.io.ObjectInput;
  import java.io.ObjectOutput;
  import java.io.InvalidObjectException;
  import java.io.ObjectInputStream;
  import java.io.Serializable;
  import java.time.chrono.IsoChronology;
  import java.time.format.DateTimeFormatter;
  import java.time.format.DateTimeParseException;
  import java.time.temporal.ChronoField;
  import java.time.temporal.ChronoUnit;
  import java.time.temporal.Temporal;
  import java.time.temporal.TemporalAccessor;
  import java.time.temporal.TemporalAdjuster;
  import java.time.temporal.TemporalAmount;
  import java.time.temporal.TemporalField;
  import java.time.temporal.TemporalQueries;
  import java.time.temporal.TemporalQuery;
  import java.time.temporal.TemporalUnit;
  import java.time.temporal.UnsupportedTemporalTypeException;
  import java.time.temporal.ValueRange;
  import java.time.zone.ZoneRules;
  import java.util.Comparator;
  import java.util.Objects;
  
  // Android-changed: removed ValueBased paragraph.
  
  /**
   * A date-time with an offset from UTC/Greenwich in the ISO-8601 calendar system,
   * such as {@code 2007-12-03T10:15:30+01:00}.
   * <p>
   * {@code OffsetDateTime} is an immutable representation of a date-time with an offset.
   * This class stores all date and time fields, to a precision of nanoseconds,
   * as well as the offset from UTC/Greenwich. For example, the value
   * "2nd October 2007 at 13:45.30.123456789 +02:00" can be stored in an {@code OffsetDateTime}.
   * <p>
   * {@code OffsetDateTime}, {@link ZonedDateTime} and {@link Instant} all store an instant
   * on the time-line to nanosecond precision.
   * {@code Instant} is the simplest, simply representing the instant.
   * {@code OffsetDateTime} adds to the instant the offset from UTC/Greenwich, which allows
   * the local date-time to be obtained.
   * {@code ZonedDateTime} adds full time-zone rules.
   * <p>
   * It is intended that {@code ZonedDateTime} or {@code Instant} is used to model data
   * in simpler applications. This class may be used when modeling date-time concepts in
   * more detail, or when communicating to a database or in a network protocol.
   *
   * @implSpec
   * This class is immutable and thread-safe.
   *
   * @since 1.8
   */
  public final class OffsetDateTime
          implements Temporal, TemporalAdjuster, Comparable<OffsetDateTime>, Serializable {
  
      /**
       * The minimum supported {@code OffsetDateTime}, '-999999999-01-01T00:00:00+18:00'.
       * This is the local date-time of midnight at the start of the minimum date
       * in the maximum offset (larger offsets are earlier on the time-line).
       * This combines {@link LocalDateTime#MIN} and {@link ZoneOffset#MAX}.
       * This could be used by an application as a "far past" date-time.
       */
      public static final OffsetDateTime MIN = LocalDateTime.MIN.atOffset(ZoneOffset.MAX);
      /**
       * The maximum supported {@code OffsetDateTime}, '+999999999-12-31T23:59:59.999999999-18:00'.
       * This is the local date-time just before midnight at the end of the maximum date
       * in the minimum offset (larger negative offsets are later on the time-line).
       * This combines {@link LocalDateTime#MAX} and {@link ZoneOffset#MIN}.
       * This could be used by an application as a "far future" date-time.
       */
      public static final OffsetDateTime MAX = LocalDateTime.MAX.atOffset(ZoneOffset.MIN);
  
      /**
       * Gets a comparator that compares two {@code OffsetDateTime} instances
       * based solely on the instant.
       * <p>
       * This method differs from the comparison in {@link #compareTo} in that it
       * only compares the underlying instant.
       *
       * @return a comparator that compares in time-line order
       *
       * @see #isAfter
       * @see #isBefore
       * @see #isEqual
       */
      public static Comparator<OffsetDateTime> timeLineOrder() {
          return OffsetDateTime::compareInstant;
      }
  
      /**
       * Compares this {@code OffsetDateTime} to another date-time.
       * The comparison is based on the instant.
       *
       * @param datetime1  the first date-time to compare, not null
       * @param datetime2  the other date-time to compare to, not null
       * @return the comparator value, negative if less, positive if greater
       */
      private static int compareInstant(OffsetDateTime datetime1, OffsetDateTime datetime2) {
          if (datetime1.getOffset().equals(datetime2.getOffset())) {
              return datetime1.toLocalDateTime().compareTo(datetime2.toLocalDateTime());
          }
          int cmp = Long.compare(datetime1.toEpochSecond(), datetime2.toEpochSecond());
          if (cmp == 0) {
              cmp = datetime1.toLocalTime().getNano() - datetime2.toLocalTime().getNano();
          }
          return cmp;
      }
  
      /**
       * Serialization version.
       */
      private static final long serialVersionUID = 2287754244819255394L;
  
      /**
       * The local date-time.
       */
      private final LocalDateTime dateTime;
      /**
       * The offset from UTC/Greenwich.
       */
      private final ZoneOffset offset;
  
      //-----------------------------------------------------------------------
      /**
       * Obtains the current date-time from the system clock in the default time-zone.
       * <p>
       * This will query the {@link Clock#systemDefaultZone() system clock} in the default
       * time-zone to obtain the current date-time.
       * The offset will be calculated from the time-zone in the clock.
       * <p>
       * Using this method will prevent the ability to use an alternate clock for testing
       * because the clock is hard-coded.
       *
       * @return the current date-time using the system clock, not null
       */
      public static OffsetDateTime now() {
          return now(Clock.systemDefaultZone());
      }
  
      /**
       * Obtains the current date-time from the system clock in the specified time-zone.
       * <p>
       * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date-time.
       * Specifying the time-zone avoids dependence on the default time-zone.
       * The offset will be calculated from the specified time-zone.
       * <p>
       * Using this method will prevent the ability to use an alternate clock for testing
       * because the clock is hard-coded.
       *
       * @param zone  the zone ID to use, not null
       * @return the current date-time using the system clock, not null
       */
      public static OffsetDateTime now(ZoneId zone) {
          return now(Clock.system(zone));
      }
  
      /**
       * Obtains the current date-time from the specified clock.
       * <p>
       * This will query the specified clock to obtain the current date-time.
       * The offset will be calculated from the time-zone in the clock.
       * <p>
       * Using this method allows the use of an alternate clock for testing.
       * The alternate clock may be introduced using {@link Clock dependency injection}.
       *
       * @param clock  the clock to use, not null
       * @return the current date-time, not null
       */
      public static OffsetDateTime now(Clock clock) {
          Objects.requireNonNull(clock, "clock");
          final Instant now = clock.instant();  // called once
          return ofInstant(now, clock.getZone().getRules().getOffset(now));
      }
  
      //-----------------------------------------------------------------------
      /**
       * Obtains an instance of {@code OffsetDateTime} from a date, time and offset.
       * <p>
       * This creates an offset date-time with the specified local date, time and offset.
       *
       * @param date  the local date, not null
       * @param time  the local time, not null
       * @param offset  the zone offset, not null
       * @return the offset date-time, not null
       */
      public static OffsetDateTime of(LocalDate date, LocalTime time, ZoneOffset offset) {
          LocalDateTime dt = LocalDateTime.of(date, time);
          return new OffsetDateTime(dt, offset);
      }
  
      /**
       * Obtains an instance of {@code OffsetDateTime} from a date-time and offset.
       * <p>
       * This creates an offset date-time with the specified local date-time and offset.
       *
       * @param dateTime  the local date-time, not null
       * @param offset  the zone offset, not null
       * @return the offset date-time, not null
       */
      public static OffsetDateTime of(LocalDateTime dateTime, ZoneOffset offset) {
          return new OffsetDateTime(dateTime, offset);
      }
  
      /**
       * Obtains an instance of {@code OffsetDateTime} from a year, month, day,
       * hour, minute, second, nanosecond and offset.
       * <p>
       * This creates an offset date-time with the seven specified fields.
       * <p>
       * This method exists primarily for writing test cases.
       * Non test-code will typically use other methods to create an offset time.
       * {@code LocalDateTime} has five additional convenience variants of the
       * equivalent factory method taking fewer arguments.
       * They are not provided here to reduce the footprint of the API.
       *
       * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
       * @param month  the month-of-year to represent, from 1 (January) to 12 (December)
       * @param dayOfMonth  the day-of-month to represent, from 1 to 31
       * @param hour  the hour-of-day to represent, from 0 to 23
       * @param minute  the minute-of-hour to represent, from 0 to 59
       * @param second  the second-of-minute to represent, from 0 to 59
       * @param nanoOfSecond  the nano-of-second to represent, from 0 to 999,999,999
       * @param offset  the zone offset, not null
       * @return the offset date-time, not null
       * @throws DateTimeException if the value of any field is out of range, or
       *  if the day-of-month is invalid for the month-year
       */
      public static OffsetDateTime of(
              int year, int month, int dayOfMonth,
              int hour, int minute, int second, int nanoOfSecond, ZoneOffset offset) {
          LocalDateTime dt = LocalDateTime.of(year, month, dayOfMonth, hour, minute, second, nanoOfSecond);
          return new OffsetDateTime(dt, offset);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Obtains an instance of {@code OffsetDateTime} from an {@code Instant} and zone ID.
       * <p>
       * This creates an offset date-time with the same instant as that specified.
       * Finding the offset from UTC/Greenwich is simple as there is only one valid
       * offset for each instant.
       *
       * @param instant  the instant to create the date-time from, not null
       * @param zone  the time-zone, which may be an offset, not null
       * @return the offset date-time, not null
       * @throws DateTimeException if the result exceeds the supported range
       */
      public static OffsetDateTime ofInstant(Instant instant, ZoneId zone) {
          Objects.requireNonNull(instant, "instant");
          Objects.requireNonNull(zone, "zone");
          ZoneRules rules = zone.getRules();
          ZoneOffset offset = rules.getOffset(instant);
          LocalDateTime ldt = LocalDateTime.ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset);
          return new OffsetDateTime(ldt, offset);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Obtains an instance of {@code OffsetDateTime} from a temporal object.
       * <p>
       * This obtains an offset date-time based on the specified temporal.
       * A {@code TemporalAccessor} represents an arbitrary set of date and time information,
       * which this factory converts to an instance of {@code OffsetDateTime}.
       * <p>
       * The conversion will first obtain a {@code ZoneOffset} from the temporal object.
       * It will then try to obtain a {@code LocalDateTime}, falling back to an {@code Instant} if necessary.
       * The result will be the combination of {@code ZoneOffset} with either
       * with {@code LocalDateTime} or {@code Instant}.
       * Implementations are permitted to perform optimizations such as accessing
       * those fields that are equivalent to the relevant objects.
       * <p>
       * This method matches the signature of the functional interface {@link TemporalQuery}
       * allowing it to be used as a query via method reference, {@code OffsetDateTime::from}.
       *
       * @param temporal  the temporal object to convert, not null
       * @return the offset date-time, not null
       * @throws DateTimeException if unable to convert to an {@code OffsetDateTime}
       */
      public static OffsetDateTime from(TemporalAccessor temporal) {
          if (temporal instanceof OffsetDateTime) {
              return (OffsetDateTime) temporal;
          }
          try {
              ZoneOffset offset = ZoneOffset.from(temporal);
              LocalDate date = temporal.query(TemporalQueries.localDate());
              LocalTime time = temporal.query(TemporalQueries.localTime());
              if (date != null && time != null) {
                  return OffsetDateTime.of(date, time, offset);
              } else {
                  Instant instant = Instant.from(temporal);
                  return OffsetDateTime.ofInstant(instant, offset);
              }
          } catch (DateTimeException ex) {
              throw new DateTimeException("Unable to obtain OffsetDateTime from TemporalAccessor: " +
                      temporal + " of type " + temporal.getClass().getName(), ex);
          }
      }
  
      //-----------------------------------------------------------------------
      /**
       * Obtains an instance of {@code OffsetDateTime} from a text string
       * such as {@code 2007-12-03T10:15:30+01:00}.
       * <p>
       * The string must represent a valid date-time and is parsed using
       * {@link DateTimeFormatter#ISO_OFFSET_DATE_TIME}.
       *
       * @param text  the text to parse such as "2007-12-03T10:15:30+01:00", not null
       * @return the parsed offset date-time, not null
       * @throws DateTimeParseException if the text cannot be parsed
       */
      public static OffsetDateTime parse(CharSequence text) {
          return parse(text, DateTimeFormatter.ISO_OFFSET_DATE_TIME);
      }
  
      /**
       * Obtains an instance of {@code OffsetDateTime} from a text string using a specific formatter.
       * <p>
       * The text is parsed using the formatter, returning a date-time.
       *
       * @param text  the text to parse, not null
       * @param formatter  the formatter to use, not null
       * @return the parsed offset date-time, not null
       * @throws DateTimeParseException if the text cannot be parsed
       */
      public static OffsetDateTime parse(CharSequence text, DateTimeFormatter formatter) {
          Objects.requireNonNull(formatter, "formatter");
          return formatter.parse(text, OffsetDateTime::from);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Constructor.
       *
       * @param dateTime  the local date-time, not null
       * @param offset  the zone offset, not null
       */
      private OffsetDateTime(LocalDateTime dateTime, ZoneOffset offset) {
          this.dateTime = Objects.requireNonNull(dateTime, "dateTime");
          this.offset = Objects.requireNonNull(offset, "offset");
      }
  
      /**
       * Returns a new date-time based on this one, returning {@code this} where possible.
       *
       * @param dateTime  the date-time to create with, not null
       * @param offset  the zone offset to create with, not null
       */
      private OffsetDateTime with(LocalDateTime dateTime, ZoneOffset offset) {
          if (this.dateTime == dateTime && this.offset.equals(offset)) {
              return this;
          }
          return new OffsetDateTime(dateTime, offset);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Checks if the specified field is supported.
       * <p>
       * This checks if this date-time can be queried for the specified field.
       * If false, then calling the {@link #range(TemporalField) range},
       * {@link #get(TemporalField) get} and {@link #with(TemporalField, long)}
       * methods will throw an exception.
       * <p>
       * If the field is a {@link ChronoField} then the query is implemented here.
       * The supported fields are:
       * <ul>
       * <li>{@code NANO_OF_SECOND}
       * <li>{@code NANO_OF_DAY}
       * <li>{@code MICRO_OF_SECOND}
       * <li>{@code MICRO_OF_DAY}
       * <li>{@code MILLI_OF_SECOND}
       * <li>{@code MILLI_OF_DAY}
       * <li>{@code SECOND_OF_MINUTE}
       * <li>{@code SECOND_OF_DAY}
       * <li>{@code MINUTE_OF_HOUR}
       * <li>{@code MINUTE_OF_DAY}
       * <li>{@code HOUR_OF_AMPM}
       * <li>{@code CLOCK_HOUR_OF_AMPM}
       * <li>{@code HOUR_OF_DAY}
       * <li>{@code CLOCK_HOUR_OF_DAY}
       * <li>{@code AMPM_OF_DAY}
       * <li>{@code DAY_OF_WEEK}
       * <li>{@code ALIGNED_DAY_OF_WEEK_IN_MONTH}
       * <li>{@code ALIGNED_DAY_OF_WEEK_IN_YEAR}
       * <li>{@code DAY_OF_MONTH}
       * <li>{@code DAY_OF_YEAR}
       * <li>{@code EPOCH_DAY}
       * <li>{@code ALIGNED_WEEK_OF_MONTH}
       * <li>{@code ALIGNED_WEEK_OF_YEAR}
       * <li>{@code MONTH_OF_YEAR}
       * <li>{@code PROLEPTIC_MONTH}
       * <li>{@code YEAR_OF_ERA}
       * <li>{@code YEAR}
       * <li>{@code ERA}
       * <li>{@code INSTANT_SECONDS}
       * <li>{@code OFFSET_SECONDS}
       * </ul>
       * All other {@code ChronoField} instances will return false.
       * <p>
       * If the field is not a {@code ChronoField}, then the result of this method
       * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}
       * passing {@code this} as the argument.
       * Whether the field is supported is determined by the field.
       *
       * @param field  the field to check, null returns false
       * @return true if the field is supported on this date-time, false if not
       */
      @Override
      public boolean isSupported(TemporalField field) {
          return field instanceof ChronoField || (field != null && field.isSupportedBy(this));
      }
  
      /**
       * Checks if the specified unit is supported.
       * <p>
       * This checks if the specified unit can be added to, or subtracted from, this date-time.
       * If false, then calling the {@link #plus(long, TemporalUnit)} and
       * {@link #minus(long, TemporalUnit) minus} methods will throw an exception.
       * <p>
       * If the unit is a {@link ChronoUnit} then the query is implemented here.
       * The supported units are:
       * <ul>
       * <li>{@code NANOS}
       * <li>{@code MICROS}
       * <li>{@code MILLIS}
       * <li>{@code SECONDS}
       * <li>{@code MINUTES}
       * <li>{@code HOURS}
       * <li>{@code HALF_DAYS}
       * <li>{@code DAYS}
       * <li>{@code WEEKS}
       * <li>{@code MONTHS}
       * <li>{@code YEARS}
       * <li>{@code DECADES}
       * <li>{@code CENTURIES}
       * <li>{@code MILLENNIA}
       * <li>{@code ERAS}
       * </ul>
       * All other {@code ChronoUnit} instances will return false.
       * <p>
       * If the unit is not a {@code ChronoUnit}, then the result of this method
       * is obtained by invoking {@code TemporalUnit.isSupportedBy(Temporal)}
       * passing {@code this} as the argument.
       * Whether the unit is supported is determined by the unit.
       *
       * @param unit  the unit to check, null returns false
       * @return true if the unit can be added/subtracted, false if not
       */
      @Override  // override for Javadoc
      public boolean isSupported(TemporalUnit unit) {
          if (unit instanceof ChronoUnit) {
              return unit != FOREVER;
          }
          return unit != null && unit.isSupportedBy(this);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Gets the range of valid values for the specified field.
       * <p>
       * The range object expresses the minimum and maximum valid values for a field.
       * This date-time is used to enhance the accuracy of the returned range.
       * If it is not possible to return the range, because the field is not supported
       * or for some other reason, an exception is thrown.
       * <p>
       * If the field is a {@link ChronoField} then the query is implemented here.
       * The {@link #isSupported(TemporalField) supported fields} will return
       * appropriate range instances.
       * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
       * <p>
       * If the field is not a {@code ChronoField}, then the result of this method
       * is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)}
       * passing {@code this} as the argument.
       * Whether the range can be obtained is determined by the field.
       *
       * @param field  the field to query the range for, not null
       * @return the range of valid values for the field, not null
       * @throws DateTimeException if the range for the field cannot be obtained
       * @throws UnsupportedTemporalTypeException if the field is not supported
       */
      @Override
      public ValueRange range(TemporalField field) {
          if (field instanceof ChronoField) {
              if (field == INSTANT_SECONDS || field == OFFSET_SECONDS) {
                  return field.range();
              }
              return dateTime.range(field);
          }
          return field.rangeRefinedBy(this);
      }
  
      /**
       * Gets the value of the specified field from this date-time as an {@code int}.
       * <p>
       * This queries this date-time for the value of the specified field.
       * The returned value will always be within the valid range of values for the field.
       * If it is not possible to return the value, because the field is not supported
       * or for some other reason, an exception is thrown.
       * <p>
       * If the field is a {@link ChronoField} then the query is implemented here.
       * The {@link #isSupported(TemporalField) supported fields} will return valid
       * values based on this date-time, except {@code NANO_OF_DAY}, {@code MICRO_OF_DAY},
       * {@code EPOCH_DAY}, {@code PROLEPTIC_MONTH} and {@code INSTANT_SECONDS} which are too
       * large to fit in an {@code int} and throw a {@code DateTimeException}.
       * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
       * <p>
       * If the field is not a {@code ChronoField}, then the result of this method
       * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
       * passing {@code this} as the argument. Whether the value can be obtained,
       * and what the value represents, is determined by the field.
       *
       * @param field  the field to get, not null
       * @return the value for the field
       * @throws DateTimeException if a value for the field cannot be obtained or
       *         the value is outside the range of valid values for the field
       * @throws UnsupportedTemporalTypeException if the field is not supported or
       *         the range of values exceeds an {@code int}
       * @throws ArithmeticException if numeric overflow occurs
       */
      @Override
      public int get(TemporalField field) {
          if (field instanceof ChronoField) {
              switch ((ChronoField) field) {
                  case INSTANT_SECONDS:
                      throw new UnsupportedTemporalTypeException("Invalid field 'InstantSeconds' for get() method, use getLong() instead");
                  case OFFSET_SECONDS:
                      return getOffset().getTotalSeconds();
              }
              return dateTime.get(field);
          }
          return Temporal.super.get(field);
      }
  
      /**
       * Gets the value of the specified field from this date-time as a {@code long}.
       * <p>
       * This queries this date-time for the value of the specified field.
       * If it is not possible to return the value, because the field is not supported
       * or for some other reason, an exception is thrown.
       * <p>
       * If the field is a {@link ChronoField} then the query is implemented here.
       * The {@link #isSupported(TemporalField) supported fields} will return valid
       * values based on this date-time.
       * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
       * <p>
       * If the field is not a {@code ChronoField}, then the result of this method
       * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
       * passing {@code this} as the argument. Whether the value can be obtained,
       * and what the value represents, is determined by the field.
       *
       * @param field  the field to get, not null
       * @return the value for the field
       * @throws DateTimeException if a value for the field cannot be obtained
       * @throws UnsupportedTemporalTypeException if the field is not supported
       * @throws ArithmeticException if numeric overflow occurs
       */
      @Override
      public long getLong(TemporalField field) {
          if (field instanceof ChronoField) {
              switch ((ChronoField) field) {
                  case INSTANT_SECONDS: return toEpochSecond();
                  case OFFSET_SECONDS: return getOffset().getTotalSeconds();
              }
              return dateTime.getLong(field);
          }
          return field.getFrom(this);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Gets the zone offset, such as '+01:00'.
       * <p>
       * This is the offset of the local date-time from UTC/Greenwich.
       *
       * @return the zone offset, not null
       */
      public ZoneOffset getOffset() {
          return offset;
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified offset ensuring
       * that the result has the same local date-time.
       * <p>
       * This method returns an object with the same {@code LocalDateTime} and the specified {@code ZoneOffset}.
       * No calculation is needed or performed.
       * For example, if this time represents {@code 2007-12-03T10:30+02:00} and the offset specified is
       * {@code +03:00}, then this method will return {@code 2007-12-03T10:30+03:00}.
       * <p>
       * To take into account the difference between the offsets, and adjust the time fields,
       * use {@link #withOffsetSameInstant}.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param offset  the zone offset to change to, not null
       * @return an {@code OffsetDateTime} based on this date-time with the requested offset, not null
       */
      public OffsetDateTime withOffsetSameLocal(ZoneOffset offset) {
          return with(dateTime, offset);
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified offset ensuring
       * that the result is at the same instant.
       * <p>
       * This method returns an object with the specified {@code ZoneOffset} and a {@code LocalDateTime}
       * adjusted by the difference between the two offsets.
       * This will result in the old and new objects representing the same instant.
       * This is useful for finding the local time in a different offset.
       * For example, if this time represents {@code 2007-12-03T10:30+02:00} and the offset specified is
       * {@code +03:00}, then this method will return {@code 2007-12-03T11:30+03:00}.
       * <p>
       * To change the offset without adjusting the local time use {@link #withOffsetSameLocal}.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param offset  the zone offset to change to, not null
       * @return an {@code OffsetDateTime} based on this date-time with the requested offset, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime withOffsetSameInstant(ZoneOffset offset) {
          if (offset.equals(this.offset)) {
              return this;
          }
          int difference = offset.getTotalSeconds() - this.offset.getTotalSeconds();
          LocalDateTime adjusted = dateTime.plusSeconds(difference);
          return new OffsetDateTime(adjusted, offset);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Gets the {@code LocalDateTime} part of this date-time.
       * <p>
       * This returns a {@code LocalDateTime} with the same year, month, day and time
       * as this date-time.
       *
       * @return the local date-time part of this date-time, not null
       */
      public LocalDateTime toLocalDateTime() {
          return dateTime;
      }
  
      //-----------------------------------------------------------------------
      /**
       * Gets the {@code LocalDate} part of this date-time.
       * <p>
       * This returns a {@code LocalDate} with the same year, month and day
       * as this date-time.
       *
       * @return the date part of this date-time, not null
       */
      public LocalDate toLocalDate() {
          return dateTime.toLocalDate();
      }
  
      /**
       * Gets the year field.
       * <p>
       * This method returns the primitive {@code int} value for the year.
       * <p>
       * The year returned by this method is proleptic as per {@code get(YEAR)}.
       * To obtain the year-of-era, use {@code get(YEAR_OF_ERA)}.
       *
       * @return the year, from MIN_YEAR to MAX_YEAR
       */
      public int getYear() {
          return dateTime.getYear();
      }
  
      /**
       * Gets the month-of-year field from 1 to 12.
       * <p>
       * This method returns the month as an {@code int} from 1 to 12.
       * Application code is frequently clearer if the enum {@link Month}
       * is used by calling {@link #getMonth()}.
       *
       * @return the month-of-year, from 1 to 12
       * @see #getMonth()
       */
      public int getMonthValue() {
          return dateTime.getMonthValue();
      }
  
      /**
       * Gets the month-of-year field using the {@code Month} enum.
       * <p>
       * This method returns the enum {@link Month} for the month.
       * This avoids confusion as to what {@code int} values mean.
       * If you need access to the primitive {@code int} value then the enum
       * provides the {@link Month#getValue() int value}.
       *
       * @return the month-of-year, not null
       * @see #getMonthValue()
       */
      public Month getMonth() {
          return dateTime.getMonth();
      }
  
      /**
       * Gets the day-of-month field.
       * <p>
       * This method returns the primitive {@code int} value for the day-of-month.
       *
       * @return the day-of-month, from 1 to 31
       */
      public int getDayOfMonth() {
          return dateTime.getDayOfMonth();
      }
  
      /**
       * Gets the day-of-year field.
       * <p>
       * This method returns the primitive {@code int} value for the day-of-year.
       *
       * @return the day-of-year, from 1 to 365, or 366 in a leap year
       */
      public int getDayOfYear() {
          return dateTime.getDayOfYear();
      }
  
      /**
       * Gets the day-of-week field, which is an enum {@code DayOfWeek}.
       * <p>
       * This method returns the enum {@link DayOfWeek} for the day-of-week.
       * This avoids confusion as to what {@code int} values mean.
       * If you need access to the primitive {@code int} value then the enum
       * provides the {@link DayOfWeek#getValue() int value}.
       * <p>
       * Additional information can be obtained from the {@code DayOfWeek}.
       * This includes textual names of the values.
       *
       * @return the day-of-week, not null
       */
      public DayOfWeek getDayOfWeek() {
          return dateTime.getDayOfWeek();
      }
  
      //-----------------------------------------------------------------------
      /**
       * Gets the {@code LocalTime} part of this date-time.
       * <p>
       * This returns a {@code LocalTime} with the same hour, minute, second and
       * nanosecond as this date-time.
       *
       * @return the time part of this date-time, not null
       */
      public LocalTime toLocalTime() {
          return dateTime.toLocalTime();
      }
  
      /**
       * Gets the hour-of-day field.
       *
       * @return the hour-of-day, from 0 to 23
       */
      public int getHour() {
          return dateTime.getHour();
      }
  
      /**
       * Gets the minute-of-hour field.
       *
       * @return the minute-of-hour, from 0 to 59
       */
      public int getMinute() {
          return dateTime.getMinute();
      }
  
      /**
       * Gets the second-of-minute field.
       *
       * @return the second-of-minute, from 0 to 59
       */
      public int getSecond() {
          return dateTime.getSecond();
      }
  
      /**
       * Gets the nano-of-second field.
       *
       * @return the nano-of-second, from 0 to 999,999,999
       */
      public int getNano() {
          return dateTime.getNano();
      }
  
      //-----------------------------------------------------------------------
      /**
       * Returns an adjusted copy of this date-time.
       * <p>
       * This returns an {@code OffsetDateTime}, based on this one, with the date-time adjusted.
       * The adjustment takes place using the specified adjuster strategy object.
       * Read the documentation of the adjuster to understand what adjustment will be made.
       * <p>
       * A simple adjuster might simply set the one of the fields, such as the year field.
       * A more complex adjuster might set the date to the last day of the month.
       * A selection of common adjustments is provided in
       * {@link java.time.temporal.TemporalAdjusters TemporalAdjusters}.
       * These include finding the "last day of the month" and "next Wednesday".
       * Key date-time classes also implement the {@code TemporalAdjuster} interface,
       * such as {@link Month} and {@link MonthDay MonthDay}.
       * The adjuster is responsible for handling special cases, such as the varying
       * lengths of month and leap years.
       * <p>
       * For example this code returns a date on the last day of July:
       * <pre>
       *  import static java.time.Month.*;
       *  import static java.time.temporal.TemporalAdjusters.*;
       *
       *  result = offsetDateTime.with(JULY).with(lastDayOfMonth());
       * </pre>
       * <p>
       * The classes {@link LocalDate}, {@link LocalTime} and {@link ZoneOffset} implement
       * {@code TemporalAdjuster}, thus this method can be used to change the date, time or offset:
       * <pre>
       *  result = offsetDateTime.with(date);
       *  result = offsetDateTime.with(time);
       *  result = offsetDateTime.with(offset);
       * </pre>
       * <p>
       * The result of this method is obtained by invoking the
       * {@link TemporalAdjuster#adjustInto(Temporal)} method on the
       * specified adjuster passing {@code this} as the argument.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param adjuster the adjuster to use, not null
       * @return an {@code OffsetDateTime} based on {@code this} with the adjustment made, not null
       * @throws DateTimeException if the adjustment cannot be made
       * @throws ArithmeticException if numeric overflow occurs
       */
      @Override
      public OffsetDateTime with(TemporalAdjuster adjuster) {
          // optimizations
          if (adjuster instanceof LocalDate || adjuster instanceof LocalTime || adjuster instanceof LocalDateTime) {
              return with(dateTime.with(adjuster), offset);
          } else if (adjuster instanceof Instant) {
              return ofInstant((Instant) adjuster, offset);
          } else if (adjuster instanceof ZoneOffset) {
              return with(dateTime, (ZoneOffset) adjuster);
          } else if (adjuster instanceof OffsetDateTime) {
              return (OffsetDateTime) adjuster;
          }
          return (OffsetDateTime) adjuster.adjustInto(this);
      }
  
      /**
       * Returns a copy of this date-time with the specified field set to a new value.
       * <p>
       * This returns an {@code OffsetDateTime}, based on this one, with the value
       * for the specified field changed.
       * This can be used to change any supported field, such as the year, month or day-of-month.
       * If it is not possible to set the value, because the field is not supported or for
       * some other reason, an exception is thrown.
       * <p>
       * In some cases, changing the specified field can cause the resulting date-time to become invalid,
       * such as changing the month from 31st January to February would make the day-of-month invalid.
       * In cases like this, the field is responsible for resolving the date. Typically it will choose
       * the previous valid date, which would be the last valid day of February in this example.
       * <p>
       * If the field is a {@link ChronoField} then the adjustment is implemented here.
       * <p>
       * The {@code INSTANT_SECONDS} field will return a date-time with the specified instant.
       * The offset and nano-of-second are unchanged.
       * If the new instant value is outside the valid range then a {@code DateTimeException} will be thrown.
       * <p>
       * The {@code OFFSET_SECONDS} field will return a date-time with the specified offset.
       * The local date-time is unaltered. If the new offset value is outside the valid range
       * then a {@code DateTimeException} will be thrown.
       * <p>
       * The other {@link #isSupported(TemporalField) supported fields} will behave as per
       * the matching method on {@link LocalDateTime#with(TemporalField, long) LocalDateTime}.
       * In this case, the offset is not part of the calculation and will be unchanged.
       * <p>
       * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
       * <p>
       * If the field is not a {@code ChronoField}, then the result of this method
       * is obtained by invoking {@code TemporalField.adjustInto(Temporal, long)}
       * passing {@code this} as the argument. In this case, the field determines
       * whether and how to adjust the instant.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param field  the field to set in the result, not null
       * @param newValue  the new value of the field in the result
       * @return an {@code OffsetDateTime} based on {@code this} with the specified field set, not null
       * @throws DateTimeException if the field cannot be set
       * @throws UnsupportedTemporalTypeException if the field is not supported
       * @throws ArithmeticException if numeric overflow occurs
       */
      @Override
      public OffsetDateTime with(TemporalField field, long newValue) {
          if (field instanceof ChronoField) {
              ChronoField f = (ChronoField) field;
              switch (f) {
                  case INSTANT_SECONDS: return ofInstant(Instant.ofEpochSecond(newValue, getNano()), offset);
                  case OFFSET_SECONDS: {
                      return with(dateTime, ZoneOffset.ofTotalSeconds(f.checkValidIntValue(newValue)));
                  }
              }
              return with(dateTime.with(field, newValue), offset);
          }
          return field.adjustInto(this, newValue);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Returns a copy of this {@code OffsetDateTime} with the year altered.
       * <p>
       * The time and offset do not affect the calculation and will be the same in the result.
       * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param year  the year to set in the result, from MIN_YEAR to MAX_YEAR
       * @return an {@code OffsetDateTime} based on this date-time with the requested year, not null
       * @throws DateTimeException if the year value is invalid
       */
      public OffsetDateTime withYear(int year) {
          return with(dateTime.withYear(year), offset);
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the month-of-year altered.
       * <p>
       * The time and offset do not affect the calculation and will be the same in the result.
       * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param month  the month-of-year to set in the result, from 1 (January) to 12 (December)
       * @return an {@code OffsetDateTime} based on this date-time with the requested month, not null
       * @throws DateTimeException if the month-of-year value is invalid
       */
      public OffsetDateTime withMonth(int month) {
          return with(dateTime.withMonth(month), offset);
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the day-of-month altered.
       * <p>
       * If the resulting {@code OffsetDateTime} is invalid, an exception is thrown.
       * The time and offset do not affect the calculation and will be the same in the result.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param dayOfMonth  the day-of-month to set in the result, from 1 to 28-31
       * @return an {@code OffsetDateTime} based on this date-time with the requested day, not null
       * @throws DateTimeException if the day-of-month value is invalid,
       *  or if the day-of-month is invalid for the month-year
       */
      public OffsetDateTime withDayOfMonth(int dayOfMonth) {
          return with(dateTime.withDayOfMonth(dayOfMonth), offset);
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the day-of-year altered.
       * <p>
       * The time and offset do not affect the calculation and will be the same in the result.
       * If the resulting {@code OffsetDateTime} is invalid, an exception is thrown.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param dayOfYear  the day-of-year to set in the result, from 1 to 365-366
       * @return an {@code OffsetDateTime} based on this date with the requested day, not null
       * @throws DateTimeException if the day-of-year value is invalid,
       *  or if the day-of-year is invalid for the year
       */
      public OffsetDateTime withDayOfYear(int dayOfYear) {
          return with(dateTime.withDayOfYear(dayOfYear), offset);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Returns a copy of this {@code OffsetDateTime} with the hour-of-day altered.
       * <p>
       * The date and offset do not affect the calculation and will be the same in the result.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param hour  the hour-of-day to set in the result, from 0 to 23
       * @return an {@code OffsetDateTime} based on this date-time with the requested hour, not null
       * @throws DateTimeException if the hour value is invalid
       */
      public OffsetDateTime withHour(int hour) {
          return with(dateTime.withHour(hour), offset);
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the minute-of-hour altered.
       * <p>
       * The date and offset do not affect the calculation and will be the same in the result.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param minute  the minute-of-hour to set in the result, from 0 to 59
       * @return an {@code OffsetDateTime} based on this date-time with the requested minute, not null
       * @throws DateTimeException if the minute value is invalid
       */
      public OffsetDateTime withMinute(int minute) {
          return with(dateTime.withMinute(minute), offset);
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the second-of-minute altered.
       * <p>
       * The date and offset do not affect the calculation and will be the same in the result.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param second  the second-of-minute to set in the result, from 0 to 59
       * @return an {@code OffsetDateTime} based on this date-time with the requested second, not null
       * @throws DateTimeException if the second value is invalid
       */
      public OffsetDateTime withSecond(int second) {
          return with(dateTime.withSecond(second), offset);
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the nano-of-second altered.
       * <p>
       * The date and offset do not affect the calculation and will be the same in the result.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param nanoOfSecond  the nano-of-second to set in the result, from 0 to 999,999,999
       * @return an {@code OffsetDateTime} based on this date-time with the requested nanosecond, not null
       * @throws DateTimeException if the nano value is invalid
       */
      public OffsetDateTime withNano(int nanoOfSecond) {
          return with(dateTime.withNano(nanoOfSecond), offset);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Returns a copy of this {@code OffsetDateTime} with the time truncated.
       * <p>
       * Truncation returns a copy of the original date-time with fields
       * smaller than the specified unit set to zero.
       * For example, truncating with the {@link ChronoUnit#MINUTES minutes} unit
       * will set the second-of-minute and nano-of-second field to zero.
       * <p>
       * The unit must have a {@linkplain TemporalUnit#getDuration() duration}
       * that divides into the length of a standard day without remainder.
       * This includes all supplied time units on {@link ChronoUnit} and
       * {@link ChronoUnit#DAYS DAYS}. Other units throw an exception.
       * <p>
       * The offset does not affect the calculation and will be the same in the result.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param unit  the unit to truncate to, not null
       * @return an {@code OffsetDateTime} based on this date-time with the time truncated, not null
       * @throws DateTimeException if unable to truncate
       * @throws UnsupportedTemporalTypeException if the unit is not supported
       */
      public OffsetDateTime truncatedTo(TemporalUnit unit) {
          return with(dateTime.truncatedTo(unit), offset);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Returns a copy of this date-time with the specified amount added.
       * <p>
       * This returns an {@code OffsetDateTime}, based on this one, with the specified amount added.
       * The amount is typically {@link Period} or {@link Duration} but may be
       * any other type implementing the {@link TemporalAmount} interface.
       * <p>
       * The calculation is delegated to the amount object by calling
       * {@link TemporalAmount#addTo(Temporal)}. The amount implementation is free
       * to implement the addition in any way it wishes, however it typically
       * calls back to {@link #plus(long, TemporalUnit)}. Consult the documentation
       * of the amount implementation to determine if it can be successfully added.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param amountToAdd  the amount to add, not null
       * @return an {@code OffsetDateTime} based on this date-time with the addition made, not null
       * @throws DateTimeException if the addition cannot be made
       * @throws ArithmeticException if numeric overflow occurs
       */
      @Override
      public OffsetDateTime plus(TemporalAmount amountToAdd) {
          return (OffsetDateTime) amountToAdd.addTo(this);
      }
  
      /**
       * Returns a copy of this date-time with the specified amount added.
       * <p>
       * This returns an {@code OffsetDateTime}, based on this one, with the amount
       * in terms of the unit added. If it is not possible to add the amount, because the
       * unit is not supported or for some other reason, an exception is thrown.
       * <p>
       * If the field is a {@link ChronoUnit} then the addition is implemented by
       * {@link LocalDateTime#plus(long, TemporalUnit)}.
       * The offset is not part of the calculation and will be unchanged in the result.
       * <p>
       * If the field is not a {@code ChronoUnit}, then the result of this method
       * is obtained by invoking {@code TemporalUnit.addTo(Temporal, long)}
       * passing {@code this} as the argument. In this case, the unit determines
       * whether and how to perform the addition.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param amountToAdd  the amount of the unit to add to the result, may be negative
       * @param unit  the unit of the amount to add, not null
       * @return an {@code OffsetDateTime} based on this date-time with the specified amount added, not null
       * @throws DateTimeException if the addition cannot be made
       * @throws UnsupportedTemporalTypeException if the unit is not supported
       * @throws ArithmeticException if numeric overflow occurs
       */
      @Override
      public OffsetDateTime plus(long amountToAdd, TemporalUnit unit) {
          if (unit instanceof ChronoUnit) {
              return with(dateTime.plus(amountToAdd, unit), offset);
          }
          return unit.addTo(this, amountToAdd);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified number of years added.
       * <p>
       * This method adds the specified amount to the years field in three steps:
       * <ol>
       * <li>Add the input years to the year field</li>
       * <li>Check if the resulting date would be invalid</li>
       * <li>Adjust the day-of-month to the last valid day if necessary</li>
       * </ol>
       * <p>
       * For example, 2008-02-29 (leap year) plus one year would result in the
       * invalid date 2009-02-29 (standard year). Instead of returning an invalid
       * result, the last valid day of the month, 2009-02-28, is selected instead.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param years  the years to add, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the years added, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime plusYears(long years) {
          return with(dateTime.plusYears(years), offset);
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified number of months added.
       * <p>
       * This method adds the specified amount to the months field in three steps:
       * <ol>
       * <li>Add the input months to the month-of-year field</li>
       * <li>Check if the resulting date would be invalid</li>
       * <li>Adjust the day-of-month to the last valid day if necessary</li>
       * </ol>
       * <p>
       * For example, 2007-03-31 plus one month would result in the invalid date
       * 2007-04-31. Instead of returning an invalid result, the last valid day
       * of the month, 2007-04-30, is selected instead.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param months  the months to add, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the months added, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime plusMonths(long months) {
          return with(dateTime.plusMonths(months), offset);
      }
  
      /**
       * Returns a copy of this OffsetDateTime with the specified number of weeks added.
       * <p>
       * This method adds the specified amount in weeks to the days field incrementing
       * the month and year fields as necessary to ensure the result remains valid.
       * The result is only invalid if the maximum/minimum year is exceeded.
       * <p>
       * For example, 2008-12-31 plus one week would result in 2009-01-07.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param weeks  the weeks to add, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the weeks added, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime plusWeeks(long weeks) {
          return with(dateTime.plusWeeks(weeks), offset);
      }
  
      /**
       * Returns a copy of this OffsetDateTime with the specified number of days added.
       * <p>
       * This method adds the specified amount to the days field incrementing the
       * month and year fields as necessary to ensure the result remains valid.
       * The result is only invalid if the maximum/minimum year is exceeded.
       * <p>
       * For example, 2008-12-31 plus one day would result in 2009-01-01.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param days  the days to add, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the days added, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime plusDays(long days) {
          return with(dateTime.plusDays(days), offset);
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified number of hours added.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param hours  the hours to add, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the hours added, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime plusHours(long hours) {
          return with(dateTime.plusHours(hours), offset);
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified number of minutes added.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param minutes  the minutes to add, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the minutes added, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime plusMinutes(long minutes) {
          return with(dateTime.plusMinutes(minutes), offset);
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified number of seconds added.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param seconds  the seconds to add, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the seconds added, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime plusSeconds(long seconds) {
          return with(dateTime.plusSeconds(seconds), offset);
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified number of nanoseconds added.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param nanos  the nanos to add, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the nanoseconds added, not null
       * @throws DateTimeException if the unit cannot be added to this type
       */
      public OffsetDateTime plusNanos(long nanos) {
          return with(dateTime.plusNanos(nanos), offset);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Returns a copy of this date-time with the specified amount subtracted.
       * <p>
       * This returns an {@code OffsetDateTime}, based on this one, with the specified amount subtracted.
       * The amount is typically {@link Period} or {@link Duration} but may be
       * any other type implementing the {@link TemporalAmount} interface.
       * <p>
       * The calculation is delegated to the amount object by calling
       * {@link TemporalAmount#subtractFrom(Temporal)}. The amount implementation is free
       * to implement the subtraction in any way it wishes, however it typically
       * calls back to {@link #minus(long, TemporalUnit)}. Consult the documentation
       * of the amount implementation to determine if it can be successfully subtracted.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param amountToSubtract  the amount to subtract, not null
       * @return an {@code OffsetDateTime} based on this date-time with the subtraction made, not null
       * @throws DateTimeException if the subtraction cannot be made
       * @throws ArithmeticException if numeric overflow occurs
       */
      @Override
      public OffsetDateTime minus(TemporalAmount amountToSubtract) {
          return (OffsetDateTime) amountToSubtract.subtractFrom(this);
      }
  
      /**
       * Returns a copy of this date-time with the specified amount subtracted.
       * <p>
       * This returns an {@code OffsetDateTime}, based on this one, with the amount
       * in terms of the unit subtracted. If it is not possible to subtract the amount,
       * because the unit is not supported or for some other reason, an exception is thrown.
       * <p>
       * This method is equivalent to {@link #plus(long, TemporalUnit)} with the amount negated.
       * See that method for a full description of how addition, and thus subtraction, works.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param amountToSubtract  the amount of the unit to subtract from the result, may be negative
       * @param unit  the unit of the amount to subtract, not null
       * @return an {@code OffsetDateTime} based on this date-time with the specified amount subtracted, not null
       * @throws DateTimeException if the subtraction cannot be made
       * @throws UnsupportedTemporalTypeException if the unit is not supported
       * @throws ArithmeticException if numeric overflow occurs
       */
      @Override
      public OffsetDateTime minus(long amountToSubtract, TemporalUnit unit) {
          return (amountToSubtract == Long.MIN_VALUE ? plus(Long.MAX_VALUE, unit).plus(1, unit) : plus(-amountToSubtract, unit));
      }
  
      //-----------------------------------------------------------------------
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified number of years subtracted.
       * <p>
       * This method subtracts the specified amount from the years field in three steps:
       * <ol>
       * <li>Subtract the input years from the year field</li>
       * <li>Check if the resulting date would be invalid</li>
       * <li>Adjust the day-of-month to the last valid day if necessary</li>
       * </ol>
       * <p>
       * For example, 2008-02-29 (leap year) minus one year would result in the
       * invalid date 2009-02-29 (standard year). Instead of returning an invalid
       * result, the last valid day of the month, 2009-02-28, is selected instead.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param years  the years to subtract, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the years subtracted, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime minusYears(long years) {
          return (years == Long.MIN_VALUE ? plusYears(Long.MAX_VALUE).plusYears(1) : plusYears(-years));
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified number of months subtracted.
       * <p>
       * This method subtracts the specified amount from the months field in three steps:
       * <ol>
       * <li>Subtract the input months from the month-of-year field</li>
       * <li>Check if the resulting date would be invalid</li>
       * <li>Adjust the day-of-month to the last valid day if necessary</li>
       * </ol>
       * <p>
       * For example, 2007-03-31 minus one month would result in the invalid date
       * 2007-04-31. Instead of returning an invalid result, the last valid day
       * of the month, 2007-04-30, is selected instead.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param months  the months to subtract, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the months subtracted, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime minusMonths(long months) {
          return (months == Long.MIN_VALUE ? plusMonths(Long.MAX_VALUE).plusMonths(1) : plusMonths(-months));
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified number of weeks subtracted.
       * <p>
       * This method subtracts the specified amount in weeks from the days field decrementing
       * the month and year fields as necessary to ensure the result remains valid.
       * The result is only invalid if the maximum/minimum year is exceeded.
       * <p>
       * For example, 2008-12-31 minus one week would result in 2009-01-07.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param weeks  the weeks to subtract, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the weeks subtracted, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime minusWeeks(long weeks) {
          return (weeks == Long.MIN_VALUE ? plusWeeks(Long.MAX_VALUE).plusWeeks(1) : plusWeeks(-weeks));
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified number of days subtracted.
       * <p>
       * This method subtracts the specified amount from the days field decrementing the
       * month and year fields as necessary to ensure the result remains valid.
       * The result is only invalid if the maximum/minimum year is exceeded.
       * <p>
       * For example, 2008-12-31 minus one day would result in 2009-01-01.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param days  the days to subtract, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the days subtracted, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime minusDays(long days) {
          return (days == Long.MIN_VALUE ? plusDays(Long.MAX_VALUE).plusDays(1) : plusDays(-days));
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified number of hours subtracted.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param hours  the hours to subtract, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the hours subtracted, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime minusHours(long hours) {
          return (hours == Long.MIN_VALUE ? plusHours(Long.MAX_VALUE).plusHours(1) : plusHours(-hours));
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified number of minutes subtracted.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param minutes  the minutes to subtract, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the minutes subtracted, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime minusMinutes(long minutes) {
          return (minutes == Long.MIN_VALUE ? plusMinutes(Long.MAX_VALUE).plusMinutes(1) : plusMinutes(-minutes));
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified number of seconds subtracted.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param seconds  the seconds to subtract, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the seconds subtracted, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime minusSeconds(long seconds) {
          return (seconds == Long.MIN_VALUE ? plusSeconds(Long.MAX_VALUE).plusSeconds(1) : plusSeconds(-seconds));
      }
  
      /**
       * Returns a copy of this {@code OffsetDateTime} with the specified number of nanoseconds subtracted.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param nanos  the nanos to subtract, may be negative
       * @return an {@code OffsetDateTime} based on this date-time with the nanoseconds subtracted, not null
       * @throws DateTimeException if the result exceeds the supported date range
       */
      public OffsetDateTime minusNanos(long nanos) {
          return (nanos == Long.MIN_VALUE ? plusNanos(Long.MAX_VALUE).plusNanos(1) : plusNanos(-nanos));
      }
  
      //-----------------------------------------------------------------------
      /**
       * Queries this date-time using the specified query.
       * <p>
       * This queries this date-time using the specified query strategy object.
       * The {@code TemporalQuery} object defines the logic to be used to
       * obtain the result. Read the documentation of the query to understand
       * what the result of this method will be.
       * <p>
       * The result of this method is obtained by invoking the
       * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
       * specified query passing {@code this} as the argument.
       *
       * @param <R> the type of the result
       * @param query  the query to invoke, not null
       * @return the query result, null may be returned (defined by the query)
       * @throws DateTimeException if unable to query (defined by the query)
       * @throws ArithmeticException if numeric overflow occurs (defined by the query)
       */
      @SuppressWarnings("unchecked")
      @Override
      public <R> R query(TemporalQuery<R> query) {
          if (query == TemporalQueries.offset() || query == TemporalQueries.zone()) {
              return (R) getOffset();
          } else if (query == TemporalQueries.zoneId()) {
              return null;
          } else if (query == TemporalQueries.localDate()) {
              return (R) toLocalDate();
          } else if (query == TemporalQueries.localTime()) {
              return (R) toLocalTime();
          } else if (query == TemporalQueries.chronology()) {
              return (R) IsoChronology.INSTANCE;
          } else if (query == TemporalQueries.precision()) {
              return (R) NANOS;
          }
          // inline TemporalAccessor.super.query(query) as an optimization
          // non-JDK classes are not permitted to make this optimization
          return query.queryFrom(this);
      }
  
      /**
       * Adjusts the specified temporal object to have the same offset, date
       * and time as this object.
       * <p>
       * This returns a temporal object of the same observable type as the input
       * with the offset, date and time changed to be the same as this.
       * <p>
       * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)}
       * three times, passing {@link ChronoField#EPOCH_DAY},
       * {@link ChronoField#NANO_OF_DAY} and {@link ChronoField#OFFSET_SECONDS} as the fields.
       * <p>
       * In most cases, it is clearer to reverse the calling pattern by using
       * {@link Temporal#with(TemporalAdjuster)}:
       * <pre>
       *   // these two lines are equivalent, but the second approach is recommended
       *   temporal = thisOffsetDateTime.adjustInto(temporal);
       *   temporal = temporal.with(thisOffsetDateTime);
       * </pre>
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param temporal  the target object to be adjusted, not null
       * @return the adjusted object, not null
       * @throws DateTimeException if unable to make the adjustment
       * @throws ArithmeticException if numeric overflow occurs
       */
      @Override
      public Temporal adjustInto(Temporal temporal) {
          // OffsetDateTime is treated as three separate fields, not an instant
          // this produces the most consistent set of results overall
          // the offset is set after the date and time, as it is typically a small
          // tweak to the result, with ZonedDateTime frequently ignoring the offset
          return temporal
                  .with(EPOCH_DAY, toLocalDate().toEpochDay())
                  .with(NANO_OF_DAY, toLocalTime().toNanoOfDay())
                  .with(OFFSET_SECONDS, getOffset().getTotalSeconds());
      }
  
      /**
       * Calculates the amount of time until another date-time in terms of the specified unit.
       * <p>
       * This calculates the amount of time between two {@code OffsetDateTime}
       * objects in terms of a single {@code TemporalUnit}.
       * The start and end points are {@code this} and the specified date-time.
       * The result will be negative if the end is before the start.
       * For example, the amount in days between two date-times can be calculated
       * using {@code startDateTime.until(endDateTime, DAYS)}.
       * <p>
       * The {@code Temporal} passed to this method is converted to a
       * {@code OffsetDateTime} using {@link #from(TemporalAccessor)}.
       * If the offset differs between the two date-times, the specified
       * end date-time is normalized to have the same offset as this date-time.
       * <p>
       * The calculation returns a whole number, representing the number of
       * complete units between the two date-times.
       * For example, the amount in months between 2012-06-15T00:00Z and 2012-08-14T23:59Z
       * will only be one month as it is one minute short of two months.
       * <p>
       * There are two equivalent ways of using this method.
       * The first is to invoke this method.
       * The second is to use {@link TemporalUnit#between(Temporal, Temporal)}:
       * <pre>
       *   // these two lines are equivalent
       *   amount = start.until(end, MONTHS);
       *   amount = MONTHS.between(start, end);
       * </pre>
       * The choice should be made based on which makes the code more readable.
       * <p>
       * The calculation is implemented in this method for {@link ChronoUnit}.
       * The units {@code NANOS}, {@code MICROS}, {@code MILLIS}, {@code SECONDS},
       * {@code MINUTES}, {@code HOURS} and {@code HALF_DAYS}, {@code DAYS},
       * {@code WEEKS}, {@code MONTHS}, {@code YEARS}, {@code DECADES},
       * {@code CENTURIES}, {@code MILLENNIA} and {@code ERAS} are supported.
       * Other {@code ChronoUnit} values will throw an exception.
       * <p>
       * If the unit is not a {@code ChronoUnit}, then the result of this method
       * is obtained by invoking {@code TemporalUnit.between(Temporal, Temporal)}
       * passing {@code this} as the first argument and the converted input temporal
       * as the second argument.
       * <p>
       * This instance is immutable and unaffected by this method call.
       *
       * @param endExclusive  the end date, exclusive, which is converted to an {@code OffsetDateTime}, not null
       * @param unit  the unit to measure the amount in, not null
       * @return the amount of time between this date-time and the end date-time
       * @throws DateTimeException if the amount cannot be calculated, or the end
       *  temporal cannot be converted to an {@code OffsetDateTime}
       * @throws UnsupportedTemporalTypeException if the unit is not supported
       * @throws ArithmeticException if numeric overflow occurs
       */
      @Override
      public long until(Temporal endExclusive, TemporalUnit unit) {
          OffsetDateTime end = OffsetDateTime.from(endExclusive);
          if (unit instanceof ChronoUnit) {
              end = end.withOffsetSameInstant(offset);
              return dateTime.until(end.dateTime, unit);
          }
          return unit.between(this, end);
      }
  
      /**
       * Formats this date-time using the specified formatter.
       * <p>
       * This date-time will be passed to the formatter to produce a string.
       *
       * @param formatter  the formatter to use, not null
       * @return the formatted date-time string, not null
       * @throws DateTimeException if an error occurs during printing
       */
      public String format(DateTimeFormatter formatter) {
          Objects.requireNonNull(formatter, "formatter");
          return formatter.format(this);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Combines this date-time with a time-zone to create a {@code ZonedDateTime}
       * ensuring that the result has the same instant.
       * <p>
       * This returns a {@code ZonedDateTime} formed from this date-time and the specified time-zone.
       * This conversion will ignore the visible local date-time and use the underlying instant instead.
       * This avoids any problems with local time-line gaps or overlaps.
       * The result might have different values for fields such as hour, minute an even day.
       * <p>
       * To attempt to retain the values of the fields, use {@link #atZoneSimilarLocal(ZoneId)}.
       * To use the offset as the zone ID, use {@link #toZonedDateTime()}.
       *
       * @param zone  the time-zone to use, not null
       * @return the zoned date-time formed from this date-time, not null
       */
      public ZonedDateTime atZoneSameInstant(ZoneId zone) {
          return ZonedDateTime.ofInstant(dateTime, offset, zone);
      }
  
      /**
       * Combines this date-time with a time-zone to create a {@code ZonedDateTime}
       * trying to keep the same local date and time.
       * <p>
       * This returns a {@code ZonedDateTime} formed from this date-time and the specified time-zone.
       * Where possible, the result will have the same local date-time as this object.
       * <p>
       * Time-zone rules, such as daylight savings, mean that not every time on the
       * local time-line exists. If the local date-time is in a gap or overlap according to
       * the rules then a resolver is used to determine the resultant local time and offset.
       * This method uses {@link ZonedDateTime#ofLocal(LocalDateTime, ZoneId, ZoneOffset)}
       * to retain the offset from this instance if possible.
       * <p>
       * Finer control over gaps and overlaps is available in two ways.
       * If you simply want to use the later offset at overlaps then call
       * {@link ZonedDateTime#withLaterOffsetAtOverlap()} immediately after this method.
       * <p>
       * To create a zoned date-time at the same instant irrespective of the local time-line,
       * use {@link #atZoneSameInstant(ZoneId)}.
       * To use the offset as the zone ID, use {@link #toZonedDateTime()}.
       *
       * @param zone  the time-zone to use, not null
       * @return the zoned date-time formed from this date and the earliest valid time for the zone, not null
       */
      public ZonedDateTime atZoneSimilarLocal(ZoneId zone) {
          return ZonedDateTime.ofLocal(dateTime, zone, offset);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Converts this date-time to an {@code OffsetTime}.
       * <p>
       * This returns an offset time with the same local time and offset.
       *
       * @return an OffsetTime representing the time and offset, not null
       */
      public OffsetTime toOffsetTime() {
          return OffsetTime.of(dateTime.toLocalTime(), offset);
      }
  
      /**
       * Converts this date-time to a {@code ZonedDateTime} using the offset as the zone ID.
       * <p>
       * This creates the simplest possible {@code ZonedDateTime} using the offset
       * as the zone ID.
       * <p>
       * To control the time-zone used, see {@link #atZoneSameInstant(ZoneId)} and
       * {@link #atZoneSimilarLocal(ZoneId)}.
       *
       * @return a zoned date-time representing the same local date-time and offset, not null
       */
      public ZonedDateTime toZonedDateTime() {
          return ZonedDateTime.of(dateTime, offset);
      }
  
      /**
       * Converts this date-time to an {@code Instant}.
       * <p>
       * This returns an {@code Instant} representing the same point on the
       * time-line as this date-time.
       *
       * @return an {@code Instant} representing the same instant, not null
       */
      public Instant toInstant() {
          return dateTime.toInstant(offset);
      }
  
      /**
       * Converts this date-time to the number of seconds from the epoch of 1970-01-01T00:00:00Z.
       * <p>
       * This allows this date-time to be converted to a value of the
       * {@link ChronoField#INSTANT_SECONDS epoch-seconds} field. This is primarily
       * intended for low-level conversions rather than general application usage.
       *
       * @return the number of seconds from the epoch of 1970-01-01T00:00:00Z
       */
      public long toEpochSecond() {
          return dateTime.toEpochSecond(offset);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Compares this date-time to another date-time.
       * <p>
       * The comparison is based on the instant then on the local date-time.
       * It is "consistent with equals", as defined by {@link Comparable}.
       * <p>
       * For example, the following is the comparator order:
       * <ol>
       * <li>{@code 2008-12-03T10:30+01:00}</li>
       * <li>{@code 2008-12-03T11:00+01:00}</li>
       * <li>{@code 2008-12-03T12:00+02:00}</li>
       * <li>{@code 2008-12-03T11:30+01:00}</li>
       * <li>{@code 2008-12-03T12:00+01:00}</li>
       * <li>{@code 2008-12-03T12:30+01:00}</li>
       * </ol>
       * Values #2 and #3 represent the same instant on the time-line.
       * When two values represent the same instant, the local date-time is compared
       * to distinguish them. This step is needed to make the ordering
       * consistent with {@code equals()}.
       *
       * @param other  the other date-time to compare to, not null
       * @return the comparator value, negative if less, positive if greater
       */
      @Override
      public int compareTo(OffsetDateTime other) {
          int cmp = compareInstant(this, other);
          if (cmp == 0) {
              cmp = toLocalDateTime().compareTo(other.toLocalDateTime());
          }
          return cmp;
      }
  
      //-----------------------------------------------------------------------
      /**
       * Checks if the instant of this date-time is after that of the specified date-time.
       * <p>
       * This method differs from the comparison in {@link #compareTo} and {@link #equals} in that it
       * only compares the instant of the date-time. This is equivalent to using
       * {@code dateTime1.toInstant().isAfter(dateTime2.toInstant());}.
       *
       * @param other  the other date-time to compare to, not null
       * @return true if this is after the instant of the specified date-time
       */
      public boolean isAfter(OffsetDateTime other) {
          long thisEpochSec = toEpochSecond();
          long otherEpochSec = other.toEpochSecond();
          return thisEpochSec > otherEpochSec ||
              (thisEpochSec == otherEpochSec && toLocalTime().getNano() > other.toLocalTime().getNano());
      }
  
      /**
       * Checks if the instant of this date-time is before that of the specified date-time.
       * <p>
       * This method differs from the comparison in {@link #compareTo} in that it
       * only compares the instant of the date-time. This is equivalent to using
       * {@code dateTime1.toInstant().isBefore(dateTime2.toInstant());}.
       *
       * @param other  the other date-time to compare to, not null
       * @return true if this is before the instant of the specified date-time
       */
      public boolean isBefore(OffsetDateTime other) {
          long thisEpochSec = toEpochSecond();
          long otherEpochSec = other.toEpochSecond();
          return thisEpochSec < otherEpochSec ||
              (thisEpochSec == otherEpochSec && toLocalTime().getNano() < other.toLocalTime().getNano());
      }
  
      /**
       * Checks if the instant of this date-time is equal to that of the specified date-time.
       * <p>
       * This method differs from the comparison in {@link #compareTo} and {@link #equals}
       * in that it only compares the instant of the date-time. This is equivalent to using
       * {@code dateTime1.toInstant().equals(dateTime2.toInstant());}.
       *
       * @param other  the other date-time to compare to, not null
       * @return true if the instant equals the instant of the specified date-time
       */
      public boolean isEqual(OffsetDateTime other) {
          return toEpochSecond() == other.toEpochSecond() &&
                  toLocalTime().getNano() == other.toLocalTime().getNano();
      }
  
      //-----------------------------------------------------------------------
      /**
       * Checks if this date-time is equal to another date-time.
       * <p>
       * The comparison is based on the local date-time and the offset.
       * To compare for the same instant on the time-line, use {@link #isEqual}.
       * Only objects of type {@code OffsetDateTime} are compared, other types return false.
       *
       * @param obj  the object to check, null returns false
       * @return true if this is equal to the other date-time
       */
      @Override
      public boolean equals(Object obj) {
          if (this == obj) {
              return true;
          }
          if (obj instanceof OffsetDateTime) {
              OffsetDateTime other = (OffsetDateTime) obj;
              return dateTime.equals(other.dateTime) && offset.equals(other.offset);
          }
          return false;
      }
  
      /**
       * A hash code for this date-time.
       *
       * @return a suitable hash code
       */
      @Override
      public int hashCode() {
          return dateTime.hashCode() ^ offset.hashCode();
      }
  
      //-----------------------------------------------------------------------
      /**
       * Outputs this date-time as a {@code String}, such as {@code 2007-12-03T10:15:30+01:00}.
       * <p>
       * The output will be one of the following ISO-8601 formats:
       * <ul>
       * <li>{@code uuuu-MM-dd'T'HH:mmXXXXX}</li>
       * <li>{@code uuuu-MM-dd'T'HH:mm:ssXXXXX}</li>
       * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSXXXXX}</li>
       * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSSXXXXX}</li>
       * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSSSSSXXXXX}</li>
       * </ul>
       * The format used will be the shortest that outputs the full value of
       * the time where the omitted parts are implied to be zero.
       *
       * @return a string representation of this date-time, not null
       */
      @Override
      public String toString() {
          return dateTime.toString() + offset.toString();
      }
  
      //-----------------------------------------------------------------------
      /**
       * Writes the object using a
       * <a href="../../serialized-form.html#java.time.Ser">dedicated serialized form</a>.
       * @serialData
       * <pre>
       *  out.writeByte(10);  // identifies an OffsetDateTime
       *  // the <a href="../../serialized-form.html#java.time.LocalDateTime">datetime</a> excluding the one byte header
       *  // the <a href="../../serialized-form.html#java.time.ZoneOffset">offset</a> excluding the one byte header
       * </pre>
       *
       * @return the instance of {@code Ser}, not null
       */
      private Object writeReplace() {
          return new Ser(Ser.OFFSET_DATE_TIME_TYPE, this);
      }
  
      /**
       * Defend against malicious streams.
       *
       * @param s the stream to read
       * @throws InvalidObjectException always
       */
      private void readObject(ObjectInputStream s) throws InvalidObjectException {
          throw new InvalidObjectException("Deserialization via serialization delegate");
      }
  
      void writeExternal(ObjectOutput out) throws IOException {
          dateTime.writeExternal(out);
          offset.writeExternal(out);
      }
  
      static OffsetDateTime readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
          LocalDateTime dateTime = LocalDateTime.readExternal(in);
          ZoneOffset offset = ZoneOffset.readExternal(in);
          return OffsetDateTime.of(dateTime, offset);
      }
  
  }
  