/*
* Copyright 2009 NCHOVY
*
* 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 org.araqne.rss.impl;
import java.util.Calendar;
import java.util.Date;
import java.text.SimpleDateFormat;
import java.util.Locale;
import java.util.regex.Pattern;
public class RssDateParser {
public static Date parse(String date) {
try {
String datePattern = null;
String datePattern1 = "[A-Za-z]{3}, \\s*\\d{1,2} [A-Za-z]{3} \\d{4} \\d{2}:\\d{2}:\\d{2} [+-]{1}\\d{4}";
String datePattern2 = "[A-Za-z]{3}, \\s*\\d{1,2} [A-Za-z]{3} \\d{4} \\d{2}:\\d{2}:\\d{2} GMT";
String datePattern3 = "\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}";
String datePattern4 = "\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}[+-]\\d{2}:\\d{2}";
String datePattern5 = "\\d{4}-\\d{2}-\\d{2}";
String datePattern6 = "\\d{4}-\\d{2}-\\d{2} ";
String datePattern7 = "\\d{1,2} [A-Za-z]{3,4} \\d{4} \\d{2}:\\d{2}:\\d{2} Z";
String datePattern8 = "\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}.\\d{3}[+-]{1}\\d{2}:\\d{2}";
String datePattern9 = "";
String normalDatePattern = "yyyy-MM-dd HH:mm:ss";
if (Pattern.matches(datePattern1, date) | Pattern.matches(datePattern2, date))
datePattern = "EEE, dd MMM yyyy HH:mm:ss Z";
else if (Pattern.matches(datePattern3, date))
datePattern = "yyyy-MM-dd'T'HH:mm:ss";
else if (Pattern.matches(datePattern4, date)) {
String timeZone = date.substring(19);
String newTimeZone = timeZone.replace(":", "");
date = date.substring(0, 19) + newTimeZone;
datePattern = "yyyy-MM-dd'T'HH:mm:ssZ";
} else if (Pattern.matches(datePattern5, date) || Pattern.matches(datePattern6, date)) {
Calendar cal = Calendar.getInstance();
String time = String.format("%02d:%02d:%02d", cal.get(Calendar.HOUR_OF_DAY), cal.get(Calendar.MINUTE),
cal.get(Calendar.SECOND));
date = date.replaceAll(" ", "") + "T" + time;
datePattern = "yyyy-MM-dd'T'HH:mm:ss";
} else if (Pattern.matches(datePattern7, date))
datePattern = "dd MMM yyyy HH:mm:ss 'Z'";
else if (Pattern.matches(datePattern8, date)) {
date = date.substring(0, 26) + "00";
datePattern = "yyyy-MM-dd'T'HH:mm:ss.SSSZ";
} else if (Pattern.matches(datePattern9, date))
return null;
java.text.SimpleDateFormat dateFormat = new SimpleDateFormat(datePattern, Locale.US);
java.text.SimpleDateFormat normalDateFormat = new SimpleDateFormat(normalDatePattern);
Date newDate = dateFormat.parse(date);
String inputDate = normalDateFormat.format(newDate);
Date resultDate = normalDateFormat.parse(inputDate);
return resultDate;
} catch (Exception e1) {
return null;
}
}
}