Parse RSS date format to Date object.
/*
* StatusFeedParser.java
*
* Copyright (C) 2005-2008 Tommi Laukkanen
* http://www.substanceofcode.com
*
* 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.
*/
//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") );
cal.setTime(date);
return
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.HOUR_OF_DAY)+":"+
cal.get(Calendar.MINUTE)+":"+
cal.get(Calendar.SECOND)+" GMT";
//Tue%2C+27+Mar+2007+22%3A55%3A48+GMT
}
}
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