se.vgregion.pubsub.content.DateTimeUtils.java Source code

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Here is the source code for se.vgregion.pubsub.content.DateTimeUtils.java

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/**
 * Copyright 2010 Vstra Gtalandsregionen
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of version 2.1 of the GNU Lesser General Public
 *   License as published by the Free Software Foundation.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the
 *   Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 *   Boston, MA 02111-1307  USA
 *
 */

package se.vgregion.pubsub.content;

import java.util.Locale;

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

public class DateTimeUtils {

    /**
     * Formats a date time to ISO 8601 format
     * @param value
     * @return
     */
    public static String print(DateTime value) {
        DateTimeFormatter fmt = ISODateTimeFormat.dateTime().withZone(DateTimeZone.UTC);
        return fmt.print(value);
    }

    /**
     * Parses common date time formats in feeds
     * @param value
     * @return
     */
    public static DateTime parseDateTime(String value) {
        // Tue, 18 Jan 2011 07:42:14 +0000

        DateTimeFormatter parser;
        if (Character.isDigit(value.charAt(0))) {
            // assume ISO
            parser = ISODateTimeFormat.dateTimeParser();
        } else {
            // assume RSS datetime
            parser = new DateTimeFormatterBuilder().appendDayOfWeekShortText().appendLiteral(", ")
                    .appendDayOfMonth(1).appendLiteral(" ").appendMonthOfYearShortText().appendLiteral(" ")
                    .appendYear(4, 4).appendLiteral(" ").appendHourOfDay(2).appendLiteral(":").appendMinuteOfHour(2)
                    .appendLiteral(":").appendSecondOfMinute(2).appendLiteral(" +0000").toFormatter();
        }

        parser = parser.withZone(DateTimeZone.UTC).withLocale(Locale.US);
        return parser.parseDateTime(value);
    }

}