Here you can find the source of formatDateHeader(final Date date)
public static String formatDateHeader(final Date date)
//package com.java2s; /**//from ww w . j a v a 2 s. c o m * Copyright (C) 2011-2018 Red Hat, Inc. (https://github.com/Commonjava/indy) * * 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. */ import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.TimeZone; public class Main { private static final String DATE_HEADER_FMT = "EEE, dd MMM yyyy HH:mm:ss"; private static final String GMT_SUFFIX = " GMT"; public static String formatDateHeader(final long date) { Calendar cal = Calendar.getInstance(); cal.setTime(new Date(date)); cal.setTimeZone(TimeZone.getTimeZone("GMT")); return new SimpleDateFormat(DATE_HEADER_FMT).format(cal.getTime()) + GMT_SUFFIX; } public static String formatDateHeader(final Date date) { Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.setTimeZone(TimeZone.getTimeZone("GMT")); return new SimpleDateFormat(DATE_HEADER_FMT).format(date) + GMT_SUFFIX; } }