org.primefaces.util.DateUtils Maven / Gradle / Ivy
/*
* Copyright 2009-2016 PrimeTek.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.primefaces.util;
import java.util.Date;
import java.util.TimeZone;
public class DateUtils {
// convert from local date to UTC
public static Date toUtcDate(TimeZone browserTZ, TimeZone targetTZ, String localDate) {
if (localDate == null) {
return null;
}
return toUtcDate(browserTZ, targetTZ, Long.valueOf(localDate));
}
// convert from local date to UTC
public static Date toUtcDate(TimeZone browserTZ, TimeZone targetTZ, long localDate) {
return toUtcDate(browserTZ, targetTZ, new Date(localDate));
}
// convert from local date to UTC
public static Date toUtcDate(TimeZone browserTZ, TimeZone targetTZ, Date localDate) {
if (localDate == null) {
return null;
}
long local = localDate.getTime();
int targetOffsetFromUTC = targetTZ.getOffset(local);
int browserOffsetFromUTC = browserTZ.getOffset(local);
return new Date(local - targetOffsetFromUTC + browserOffsetFromUTC);
}
// convert from UTC to local date
public static long toLocalDate(TimeZone browserTZ, TimeZone targetTZ, Date utcDate) {
long utc = utcDate.getTime();
int targetOffsetFromUTC = targetTZ.getOffset(utc);
int browserOffsetFromUTC = browserTZ.getOffset(utc);
return utc + targetOffsetFromUTC - browserOffsetFromUTC;
}
}