DateTimeUtil.java

/**
 * Copyright 2008 The University of North Carolina at Chapel Hill
 *
 * 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 edu.unc.lib.dl.util;

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

import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;

/**
 * @author Gregory Jansen
 *
 */
public class DateTimeUtil {

	public final static DateTimeFormatter utcFormatter = DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")
			.withZone(DateTimeZone.UTC);
	public final static DateTimeFormatter utcYMDFormatter = DateTimeFormat.forPattern("yyyy-MM-dd").withZone(
			DateTimeZone.UTC);

	public static Date parseUTCDateToDate(String utcDate) throws ParseException {
		return ISODateTimeFormat.dateParser().parseDateTime(utcDate).toDate();
	}

	public static Date parseUTCToDate(String utcDate) throws ParseException {
		return parseUTCToDateTime(utcDate).toDate();
	}

	public static DateTime parseUTCToDateTime(String utcDate) throws IllegalArgumentException {
		DateTime isoDT = ISODateTimeFormat.dateTimeParser().withOffsetParsed().parseDateTime(utcDate);
		return isoDT.withZone(DateTimeZone.forID("UTC"));
	}

	public static String formatDateToUTC(Date date) throws ParseException {
		DateTime dateTime = new DateTime(date);
		return utcFormatter.print(dateTime);
	}
}