Date format for face book : Date Format « Data Type « Java






  1. Java
  2. Data Type
  3. Date Format

Date format for face book

      

/*
 * Copyright (c) 2010-2011 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.
 */

//package com.restfb.util;

import static java.util.logging.Level.FINE;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.Logger;

/**
 * A collection of date-handling utility methods.
 * 
 * @author <a href="http://restfb.com">Mark Allen</a>
 * @since 1.6
 */
public final class DateUtils {
  /**
   * 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";

  /**
   * Facebook short date format. Example: {@code 04/15/1984}
   */
  public static final String FACEBOOK_SHORT_DATE_FORMAT = "MM/dd/yyyy";

  /**
   * Facebook month-year only date format. Example: {@code Example: 2007-03}
   */
  public static final String FACEBOOK_MONTH_YEAR_DATE_FORMAT = "yyyy-MM";

  /**
   * Logger.
   */
  private static final Logger logger = Logger.getLogger(DateUtils.class.getName());

  /**
   * Prevents instantiation.
   */
  private DateUtils() {}

  /**
   * Returns a Java representation of a Facebook "long" {@code date} string.
   * <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) {
    Date parsedDate = toDateWithFormatString(date, FACEBOOK_LONG_DATE_FORMAT);

    if (parsedDate == null)
      parsedDate = toDateWithFormatString(date, FACEBOOK_LONG_DATE_FORMAT_WITHOUT_TIMEZONE);

    return parsedDate;
  }

  /**
   * Returns a Java representation of a Facebook "short" {@code date} string.
   * 
   * @param date
   *          Facebook {@code date} string.
   * @return Java date representation of the given Facebook "short" {@code date}
   *         string or {@code null} if {@code date} is {@code null} or invalid.
   */
  public static Date toDateFromShortFormat(String date) {
    return toDateWithFormatString(date, FACEBOOK_SHORT_DATE_FORMAT);
  }

  /**
   * Returns a Java representation of a Facebook "month-year" {@code date}
   * string.
   * 
   * @param date
   *          Facebook {@code date} string.
   * @return Java date representation of the given Facebook "month-year"
   *         {@code date} string or {@code null} if {@code date} is {@code null}
   *         or invalid.
   */
  public static Date toDateFromMonthYearFormat(String date) {
    if ("0000-00".equals(date))
      return null;

    return toDateWithFormatString(date, FACEBOOK_MONTH_YEAR_DATE_FORMAT);
  }

  /**
   * 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(FINE))
        logger.fine("Unable to parse date '" + date + "' using format string '" + format + "': " + e);

      return null;
    }
  }
}








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