content: /**
   * This file is part of Aion-Lightning <aion-lightning.org>.
   *
   *  Aion-Lightning is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  Aion-Lightning 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 for more details. *
   *  You should have received a copy of the GNU General Public License
   *  along with Aion-Lightning.
   *  If not, see <http://www.gnu.org/licenses/>.
   */
  package com.aionemu.gameserver.utils.gametime;
  
  import java.util.GregorianCalendar;
  
  import org.joda.time.DateTime;
  import org.joda.time.DateTimeZone;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.aionemu.gameserver.configs.main.GSConfig;
  
  /**
   * @author Rolandas
   */
  public final class DateTimeUtil {
  
  	static Logger log = LoggerFactory.getLogger(DateTimeUtil.class);
  	private static boolean canApplyZoneChange = false;
  
  	public static void init() {
  		try {
  			if (!GSConfig.TIME_ZONE_ID.isEmpty()) {
  				// just check the validity on start (if invalid zone specified in the switch, default id used)
  				DateTimeZone.forID(System.getProperty("Duser.timezone"));
  				DateTimeZone.forID(GSConfig.TIME_ZONE_ID);
  				canApplyZoneChange = true;
  			}
  		}
  		catch (Throwable e) {
  			log.error("Invalid or not supported timezones specified!!!\n" + "Use both -Duser.timezone=\"timezone_id\" switch from command line\n" + "and add a valid value for GSConfig.TIME_ZONE_ID");
  		}
  	}
  
  	// Get now date and time
  	public static DateTime getDateTime() {
  		DateTime dt = new DateTime();
  		if (canApplyZoneChange) {
  			return dt.withZoneRetainFields(DateTimeZone.forID(GSConfig.TIME_ZONE_ID));
  		}
  		return dt;
  	}
  
  	public static DateTime getDateTime(String isoDateTime) {
  		DateTime dt = new DateTime(isoDateTime);
  		if (canApplyZoneChange) {
  			return dt.withZoneRetainFields(DateTimeZone.forID(GSConfig.TIME_ZONE_ID));
  		}
  		return dt;
  	}
  
  	public static DateTime getDateTime(GregorianCalendar calendar) {
  		DateTime dt = new DateTime(calendar);
  		if (canApplyZoneChange) {
  			return dt.withZoneRetainFields(DateTimeZone.forID(GSConfig.TIME_ZONE_ID));
  		}
  		return dt;
  	}
  
  	public static DateTime getDateTime(long millisSinceSeventies) {
  		DateTime dt = new DateTime(millisSinceSeventies);
  		if (canApplyZoneChange) {
  			return dt.withZoneRetainFields(DateTimeZone.forID(GSConfig.TIME_ZONE_ID));
  		}
  		return dt;
  	}
  
  	public static boolean canApplyZoneChange() {
  		return canApplyZoneChange;
  	}
  }
  