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The CloudBees API Client library for Java
There is a newer version: 1.5.9
/*
 * Copyright 2010-2012, CloudBees Inc.
 *
 * 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.cloudbees.api;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

public class DateHelper {
    public static Date parseW3CDate(String dateString) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ",
                Locale.US);
        int tzMinuteIndex = dateString.length() - 3;
        if (dateString.charAt(tzMinuteIndex) == ':') //strip ':' from timezone since sdf can't handle it
        {
            dateString = dateString.substring(0, tzMinuteIndex) + dateString.substring(tzMinuteIndex + 1);
        }

        Date d = sdf.parse(dateString);
        return d;
    }

    public static Date parseRssDate(String dateString) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z",
                Locale.US);
        Date d = sdf.parse(dateString);
        return d;
    }

    public static Date parseW3CDateWithFractionalSeconds(String dateString) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'",
                Locale.US);

        Date d = sdf.parse(dateString);
        return d;
    }

    public static String toW3CDateString(Date d) {
        //SimpleDateFormat sdf = new SimpleDateFormat("MM-dd-yyyy'T'");
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ",
                Locale.US);
        String dateString = sdf.format(d);

        //insert the : char into the timezone to make it truly W3C
        int tzMinuteIndex = dateString.length() - 2;
        dateString = dateString.substring(0, tzMinuteIndex) + ":" + dateString.substring(tzMinuteIndex);
        return dateString;
    }

    public static Date parseW3CDateRobust(String dateString) throws ParseException {
        try {
            return parseW3CDate(dateString);
        } catch (ParseException e) {
            return parseW3CDateWithFractionalSeconds(dateString);
        }
    }
}