content: package local.org.bouncycastle.asn1.x509;
  
  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  import java.util.Date;
  import java.util.SimpleTimeZone;
  
  import local.org.bouncycastle.asn1.ASN1Choice;
  import local.org.bouncycastle.asn1.ASN1Object;
  import local.org.bouncycastle.asn1.ASN1Primitive;
  import local.org.bouncycastle.asn1.ASN1TaggedObject;
  import local.org.bouncycastle.asn1.DERGeneralizedTime;
  import local.org.bouncycastle.asn1.DERUTCTime;
  
  
  public class Time
      extends ASN1Object
      implements ASN1Choice
  {
      ASN1Primitive time;
  
      public static Time getInstance(
          ASN1TaggedObject obj,
          boolean          explicit)
      {
          return getInstance(obj.getObject()); // must be explicitly tagged
      }
  
      public Time(
          ASN1Primitive   time)
      {
          if (!(time instanceof DERUTCTime)
              && !(time instanceof DERGeneralizedTime))
          {
              throw new IllegalArgumentException("unknown object passed to Time");
          }
  
          this.time = time; 
      }
  
      /**
       * creates a time object from a given date - if the date is between 1950
       * and 2049 a UTCTime object is generated, otherwise a GeneralizedTime
       * is used.
       */
      public Time(
          Date    date)
      {
          SimpleTimeZone      tz = new SimpleTimeZone(0, "Z");
          SimpleDateFormat    dateF = new SimpleDateFormat("yyyyMMddHHmmss");
  
          dateF.setTimeZone(tz);
  
          String  d = dateF.format(date) + "Z";
          int     year = Integer.parseInt(d.substring(0, 4));
  
          if (year < 1950 || year > 2049)
          {
              time = new DERGeneralizedTime(d);
          }
          else
          {
              time = new DERUTCTime(d.substring(2));
          }
      }
  
      public static Time getInstance(
          Object  obj)
      {
          if (obj == null || obj instanceof Time)
          {
              return (Time)obj;
          }
          else if (obj instanceof DERUTCTime)
          {
              return new Time((DERUTCTime)obj);
          }
          else if (obj instanceof DERGeneralizedTime)
          {
              return new Time((DERGeneralizedTime)obj);
          }
  
          throw new IllegalArgumentException("unknown object in factory: " + obj.getClass().getName());
      }
  
      public String getTime()
      {
          if (time instanceof DERUTCTime)
          {
              return ((DERUTCTime)time).getAdjustedTime();
          }
          else
          {
              return ((DERGeneralizedTime)time).getTime();
          }
      }
  
      public Date getDate()
      {
          try
          {
              if (time instanceof DERUTCTime)
              {
                  return ((DERUTCTime)time).getAdjustedDate();
              }
              else
              {
                  return ((DERGeneralizedTime)time).getDate();
              }
          }
          catch (ParseException e)
          {         // this should never happen
              throw new IllegalStateException("invalid date string: " + e.getMessage());
          }
      }
  
      /**
       * Produce an object suitable for an ASN1OutputStream.
       * <pre>
       * Time ::= CHOICE {
       *             utcTime        UTCTime,
       *             generalTime    GeneralizedTime }
       * </pre>
       */
      public ASN1Primitive toASN1Primitive()
      {
          return time;
      }
  
      public String toString()
      {
          return getTime();
      }
  }
  