Here you can find the source of timeStampGMT(Date date)
public static String timeStampGMT(Date date)
//package com.java2s; /*/*w w w. j a va2 s . com*/ * __ .__ .__ ._____. * _/ |_ _______ __|__| ____ | | |__\_ |__ ______ * \ __\/ _ \ \/ / |/ ___\| | | || __ \ / ___/ * | | ( <_> > <| \ \___| |_| || \_\ \\___ \ * |__| \____/__/\_ \__|\___ >____/__||___ /____ > * \/ \/ \/ \/ * * Copyright (c) 2006-2011 Karsten Schmidt * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * http://creativecommons.org/licenses/LGPL/2.1/ * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA */ import java.text.SimpleDateFormat; import java.util.Date; import java.util.TimeZone; public class Main { public static final TimeZone GMT = TimeZone.getTimeZone("GMT"); public static final SimpleDateFormat FORMAT = new SimpleDateFormat("yyyyMMdd-HHmmss"); /** * Creates a formatted timestamp string of the current date in GMT. * * @return timestamp */ public static String timeStampGMT() { return timeStamp(new Date(), GMT); } /** * Creates a formatted timestamp string of the given date in GMT. * * @return timestamp */ public static String timeStampGMT(Date date) { return timeStamp(date, GMT); } /** * Creates a formatted timestamp string of the given epoch in GMT. * * @return timestamp */ public static String timeStampGMT(long t) { return timeStamp(new Date(t), GMT); } /** * Creates a formatted timestamp string of the current datetime using the * local host timezone. * * @return timestamp */ public static String timeStamp() { return timeStamp(new Date(), null); } /** * Creates a formatted timestamp string of the given date using the local * host timezone. * * @param date * @return timestamp */ public static String timeStamp(Date date) { return timeStamp(date, null); } /** * Creates a formatted timestamp string of the given date using the * specified timezone. * * @param date * @param zone * @return timestamp */ public static String timeStamp(Date date, TimeZone zone) { if (zone == null) { zone = TimeZone.getDefault(); } FORMAT.setTimeZone(zone); return FORMAT.format(date); } /** * Creates a formatted timestamp string of the given epoch using the local * host timezone. * * @param t * unix epoch timestamp * @return timestamp */ public static String timeStamp(long t) { return timeStamp(new Date(t), null); } }