public static Date convertToServerDate(String userTimeZone, Date userDate) {
		TimeZone userLocal = TimeZone.getTimeZone(userTimeZone);
		int rawOffset = TimeZone.getDefault().getRawOffset() - userLocal.getRawOffset();
		return new Date(userDate.getTime() + rawOffset);
	}
Convert user date to new date with server side Locale.

@param userTimeZone	user TimeZone id
@param userDate		date in user's Local
@return serverDate data in server's Local
ngrinder-core/src/main/java/org/ngrinder/common/util/DateUtils.java