Android Open Source - EverToDo Relative Date

• Back to App/todo  ↑

From Project

Back to project page EverToDo.

License

The source code is released under:

GNU General Public License

Java Source Code

/**
 *//  ww  w. jav  a 2 s. c o m
 * Todo.txt Touch/src/com/todotxt/todotxttouch/util/RelativeDate.java
 *
 * Copyright (c) 2009-2011
 *
 * LICENSE:
 *
 * This file is part of Todo.txt Touch, an Android app for managing your todo.txt file (http://todotxt.com).
 *
 * Todo.txt Touch is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any
 * later version.
 *
 * Todo.txt Touch 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 General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with Todo.txt Touch.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * @license http://www.gnu.org/licenses/gpl.html
 * @copyright 2009-2011
 */
//Thanks to: http://kurtischiappone.com/programming/java/relative-date
package com.todotxt.todotxttouch.util;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public class RelativeDate {

  private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

  /**
   * This method computes the relative date according to the Calendar being
   * passed in and the number of years, months, days, etc. that differ. This
   * will compute both past and future relative dates. E.g., "one day ago" and
   * "one day from now".
   * <p>
   * <strong>NOTE:</strong> If the calendar date relative to "now" is older
   * than one day, we display the actual date in its default format as
   * specified by this class. The date format may be changed by calling
   * {@link RelativeDate#setDateFormat(SimpleDateFormat)} If you don't want to
   * show the actual date, but you want to show the relative date for days,
   * months, and years, you can add the other cases in by copying the logic
   * for hours, minutes, seconds.
   *
   * @param calendar
   * @param years
   * @param months
   * @param days
   * @param hours
   * @param minutes
   * @param seconds
   * @return String representing the relative date
   */

  private static String computeRelativeDate(Calendar calendar, int years,
      int months, int days, int hours, int minutes, int seconds) {

    String date = sdf.format(calendar.getTime());

    if (years == 0 && months == 0) {
      if (days < -1)
        return Math.abs(days) + " days ago";
      else if (days == -1)
        return "1 day ago";
      else if (days == 0)
        return "today";
    } else if (years == 0 || years == -1) {
      if (years == -1) {
        months = 11 - months + Calendar.getInstance().get(Calendar.MONTH);
        if (months == 1)
          return "1 month ago";
        else
          return months + " months ago";
      } else {
        if (months != -1)
          return Math.abs(months) + " months ago";
        else
          return "1 month ago";
      }
    } else {
      return date;
    }
    return date;

  }

  /**
   * This method returns a String representing the relative date by comparing
   * the Calendar being passed in to the date / time that it is right now.
   *
   * @param calendar
   * @return String representing the relative date
   */

  public static String getRelativeDate(Calendar calendar) {

    Calendar now = GregorianCalendar.getInstance();

    int years = calendar.get(Calendar.YEAR) - now.get(Calendar.YEAR);
    int months = calendar.get(Calendar.MONTH) - now.get(Calendar.MONTH);
    int days = calendar.get(Calendar.DAY_OF_MONTH)
        - now.get(Calendar.DAY_OF_MONTH);
    int hours = calendar.get(Calendar.HOUR_OF_DAY)
        - now.get(Calendar.HOUR_OF_DAY);
    int minutes = calendar.get(Calendar.MINUTE) - now.get(Calendar.MINUTE);
    int seconds = calendar.get(Calendar.SECOND) - now.get(Calendar.SECOND);

    return computeRelativeDate(calendar, years, months, days, hours,
        minutes, seconds);

  }

  /**
   * This method returns a String representing the relative date by comparing
   * the Date being passed in to the date / time that it is right now.
   *
   * @param date
   * @return String representing the relative date
   */

  public static String getRelativeDate(Date date) {
    Calendar converted = GregorianCalendar.getInstance();
    converted.setTime(date);
    return getRelativeDate(converted);
  }

  /**
   * This method sets the date format. This is used when the relative date is
   * beyond one day. E.g., if the relative date is > 1 day, we will display
   * the date in the format: h:mm a MMM dd, yyyy
   * <p>
   * This can be changed by passing in a new simple date format and then
   * calling {@link RelativeDate#getRelativeDate(Calendar)} or
   * {@link RelativeDate#getRelativeDate(Date)}.
   *
   * @param dateFormat
   */

  public static void setDateFormat(SimpleDateFormat dateFormat) {
    sdf = dateFormat;
  }

}

Java Source Code List

• Back to App/todo  ↑