Android Date String to Date Convert toDateFromLongFormat(String date)

Description

Returns a Java representation of a Facebook "long" date string, or the number of seconds since the epoch.

License

Open Source License

Parameter

Parameter	Description
date	Facebook date string.

Return

Java date representation of the given Facebook "long" date string or null if date is null or invalid.

Declaration

public static Date toDateFromLongFormat(String date)

Method Source Code

/*/*w w  w  .  j  a  va2 s  . c  o  m*/
 * Copyright (c) 2010-2012 Mark Allen.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import static java.lang.String.format;
import static java.util.logging.Level.FINER;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.Logger;

public class Main{
    /**
     * Facebook "long" date format (IETF RFC 3339). Example: {@code 2010-02-28T16:11:08+0000}
     */
    public static final String FACEBOOK_LONG_DATE_FORMAT = "yyyy-MM-dd'T'HH:mm:ssZ";
    /**
     * Facebook "long" date format (IETF RFC 3339) without a timezone component. Example: {@code 2010-02-28T16:11:08}
     */
    public static final String FACEBOOK_LONG_DATE_FORMAT_WITHOUT_TIMEZONE = "yyyy-MM-dd'T'HH:mm:ss";
    /**
     * Logger.
     */
    private static final Logger logger = Logger.getLogger(DateUtils.class
            .getName());
    /**
     * Returns a Java representation of a Facebook "long" {@code date} string, or the number of seconds since the epoch.
     * <p>
     * Supports dates with or without timezone information.
     * 
     * @param date
     *          Facebook {@code date} string.
     * @return Java date representation of the given Facebook "long" {@code date} string or {@code null} if {@code date}
     *         is {@code null} or invalid.
     */
    public static Date toDateFromLongFormat(String date) {
        if (date == null)
            return null;

        // Is this an all-digit date? Then assume it's the "seconds since epoch"
        // variant
        if (date.trim().matches("\\d+"))
            return new Date(Long.valueOf(date) * 1000L);

        Date parsedDate = toDateWithFormatString(date,
                FACEBOOK_LONG_DATE_FORMAT);

        // Fall back to variant without timezone if the initial parse fails
        if (parsedDate == null)
            parsedDate = toDateWithFormatString(date,
                    FACEBOOK_LONG_DATE_FORMAT_WITHOUT_TIMEZONE);

        return parsedDate;
    }
    /**
     * Returns a Java representation of a {@code date} string.
     * 
     * @param date
     *          Date in string format.
     * @return Java date representation of the given {@code date} string or {@code null} if {@code date} is {@code null}
     *         or invalid.
     */
    private static Date toDateWithFormatString(String date, String format) {
        if (date == null)
            return null;

        try {
            return new SimpleDateFormat(format).parse(date);
        } catch (ParseException e) {
            if (logger.isLoggable(FINER))
                logger.fine(format(
                        "Unable to parse date '%s' using format string '%s': %s",
                        date, format, e));

            return null;
        }
    }
}