Here you can find the source of parseDateHeader(String header)
public static long parseDateHeader(String header)
//package com.java2s; /**//from ww w . ja va 2 s . c o m * Copyright 2007-2016, Kaazing Corporation. All rights reserved. * * 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.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Locale; public class Main { private static final DateFormat[] RFC822_PARSE_PATTERNS = new DateFormat[] { new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.ENGLISH), new SimpleDateFormat("EEE, d MMM yy HH:mm:ss z", Locale.ENGLISH), new SimpleDateFormat("EEE, d MMM yy HH:mm z", Locale.ENGLISH), new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss z", Locale.ENGLISH), new SimpleDateFormat("EEE, d MMM yyyy HH:mm z", Locale.ENGLISH), new SimpleDateFormat("d MMM yy HH:mm z", Locale.ENGLISH), new SimpleDateFormat("d MMM yy HH:mm:ss z", Locale.ENGLISH), new SimpleDateFormat("d MMM yyyy HH:mm z", Locale.ENGLISH), new SimpleDateFormat("d MMM yyyy HH:mm:ss z", Locale.ENGLISH) }; public static long parseDateHeader(String header) { if (header != null && header.length() > 0) { for (DateFormat rfc822Format : RFC822_PARSE_PATTERNS) { try { Date headerDate = rfc822Format.parse(header); return headerDate.getTime(); } catch (NumberFormatException e) { // ignore, try next RFC822 format continue; } catch (ParseException e) { // ignore, try next RFC822 format continue; } } } throw new IllegalArgumentException("Unable to parse date header: " + header); } }