Parse RSS date format to Date object. : Date Format « Data Type « Java

Parse RSS date format to Date object.

 * Copyright (C) 2005-2008 Tommi Laukkanen
 * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

//package com.sugree.utils;

import java.util.TimeZone;
import java.util.Calendar;
import java.util.Date;
import java.util.Vector;

//import com.substanceofcode.utils.StringUtil;

public class DateUtil {
  private static final String[] DAY_OF_WEEK = {
    "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
  private static final String[] MONTH = {
    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};

     * Parse RSS date format to Date object.
     * Example of RSS date:
     * Sat, 23 Sep 2006 22:25:11 +0000
    public static Date parseDate(String dateString) {
        Date pubDate = null;
        try {
            // Split date string to values
            // 0 = week day
            // 1 = day of month
            // 2 = month
            // 3 = year (could be with either 4 or 2 digits)
            // 4 = time
            // 5 = GMT
            int weekDayIndex = 0;
            int dayOfMonthIndex = 2;
            int monthIndex = 1;
            int yearIndex = 5;
            int timeIndex = 3;
            int gmtIndex = 4;

            String[] values = dateString.split(" ");
            int columnCount = values.length;
            // Wed Aug 29 20:14:27 +0000 2007

            if( columnCount==5 ) {
                // Expected format:
                // 09 Nov 2006 23:18:49 EST
                dayOfMonthIndex = 0;
                monthIndex = 1;
                yearIndex = 2;
                timeIndex = 3;
                gmtIndex = 4;
            } else if( columnCount==7 ) {
                // Expected format:
                // Thu, 19 Jul  2007 00:00:00 N
                yearIndex = 4;
                timeIndex = 5;
                gmtIndex = 6;
            } else if( columnCount<5 || columnCount>6 ) {
                throw new Exception("Invalid date format: " + dateString);

            // Day of month
            int dayOfMonth = Integer.parseInt( values[ dayOfMonthIndex ] );

            // Month
            String[] months =  {
                "Jan", "Feb", "Mar", "Apr", "May", "Jun",
                "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
            String monthString = values[ monthIndex ];
            int month=0;
            for(int monthEnumIndex=0; monthEnumIndex<12; monthEnumIndex++) {
                if( monthString.equals( months[ monthEnumIndex ] )) {
                    month = monthEnumIndex;

            // Year
            int year = Integer.parseInt(values[ yearIndex ]);
            if(year<100) {
                year += 2000;

            // Time
            String[] timeValues = values[ timeIndex ].split(":");
            int hours = Integer.parseInt( timeValues[0] );
            int minutes = Integer.parseInt( timeValues[1] );
            int seconds = Integer.parseInt( timeValues[2] );

            pubDate = getCal(dayOfMonth, month, year, hours, minutes, seconds, values[ gmtIndex ]);

        } catch(Exception ex) {
            // TODO: Add exception handling code
            System.err.println("parseRssDate error while converting date string to object: " +
                    dateString + "," + ex.toString());
        } catch(Throwable t) {
            // TODO: Add exception handling code
            System.err.println("parseRssDate error while converting date string to object: " +
                    dateString + "," + t.toString());
        return pubDate;

    /** Get calendar date. **/
    public static Date getCal(int dayOfMonth, int month, int year, int hours,
                               int minutes, int seconds, String timezone) throws Exception {
            // Create calendar object from date values
            Calendar cal = Calendar.getInstance();
            cal.setTimeZone( TimeZone.getTimeZone("GMT"+timezone) );
            cal.set(Calendar.DAY_OF_MONTH, dayOfMonth);
            cal.set(Calendar.MONTH, month);
            cal.set(Calendar.YEAR, year);
            cal.set(Calendar.HOUR_OF_DAY, hours);
            cal.set(Calendar.MINUTE, minutes);
            cal.set(Calendar.SECOND, seconds);

            return cal.getTime();

  public static String formatHTTPDate(Date date) {
    Calendar cal = Calendar.getInstance();
        cal.setTimeZone( TimeZone.getTimeZone("GMT+0") );
      DAY_OF_WEEK[cal.get(Calendar.DAY_OF_WEEK)-1]+", "+
      cal.get(Calendar.DAY_OF_MONTH)+" "+
      MONTH[cal.get(Calendar.MONTH)]+" "+
      cal.get(Calendar.YEAR)+" "+
      cal.get(Calendar.SECOND)+" GMT";


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