Here you can find the source of formatDateHeader(long value)
public static String formatDateHeader(long value)
//package com.java2s; /*//from w w w . j a v a 2 s .co m * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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. */ import java.text.SimpleDateFormat; import java.util.Date; import java.util.Locale; import java.util.TimeZone; public class Main { private static final String HTTP_RESPONSE_DATE_HEADER = "EEE, dd MMM yyyy HH:mm:ss zzz"; private static final TimeZone GMT = TimeZone.getTimeZone("GMT"); public static String formatDateHeader(long value) { SimpleDateFormat format = new SimpleDateFormat(HTTP_RESPONSE_DATE_HEADER, Locale.US); format.setTimeZone(GMT); return format.format(new Date(value)); } }