// Copyright (c) 2003-2012, Jodd Team (jodd.org). All Rights Reserved.
package jodd.datetime;
import java.util.TimeZone;
/**
* Misc timezone utilities.
*/
public class TimeZoneUtil {
/**
* Returns raw offset difference in milliseconds.
*/
public static int getRawOffsetDifference(TimeZone from, TimeZone to) {
int offsetBefore = from.getRawOffset();
int offsetAfter = to.getRawOffset();
return offsetAfter - offsetBefore;
}
/**
* Returns offset difference in milliseconds for given time.
*/
public static int getOffsetDifference(long now, TimeZone from, TimeZone to) {
int offsetBefore = from.getOffset(now);
int offsetAfter = to.getOffset(now);
return offsetAfter - offsetBefore;
}
/**
* Get offset difference in milliseconds for given jdatetime.
*/
public static int getOffset(JDateTime jdt, TimeZone tz) {
return tz.getOffset(
jdt.getEra(),
jdt.getYear(),
jdt.getMonth() - 1,
jdt.getDay(),
TimeUtil.toCalendarDayOfWeek(jdt.getDayOfWeek()),
jdt.getMillisOfDay()
);
}
public static int getOffsetDifference(JDateTime jdt, TimeZone from, TimeZone to) {
int offsetBefore = getOffset(jdt, from);
int offsetAfter = getOffset(jdt, to);
return offsetAfter - offsetBefore;
}
}
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