Android Open Source - myglob Date Utils

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * MyGlob Android Application//w  ww.ja v  a  2s. c  o m
 * 
 * Copyright (C) 2013 Petar Petrov
 *
 * This program 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 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package net.vexelon.myglob.utils;

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;

/**
 * @author p.petrov
 */
public class DateUtils {
  
  public static final long MILLIS_PER_DAY = (24 * 60 * 60 * 1000);
  
  protected static Calendar CALENDAR = Calendar.getInstance();
  

  /**
   * Millisecond representation of the given time
   * @return milliseconds representing the given time
   */
  public static long calculateTime(int hours, int minutes, int seconds, int ms){
    return (((((hours * 60) + minutes) * 60) + seconds) * 1000) + ms;  
  }
  
  /**
   * @see {@link #calculateTime(int, int, int, int)}
   */
  public static long calculateTime(int hours, int minutes, int seconds){
    return calculateTime(hours, minutes, seconds, 0);  
  }
  
  public static long getTimeFromDate(Date date){
    Date now = Calendar.getInstance().getTime();
    long timePortion = now.getTime() % MILLIS_PER_DAY;
    
    return timePortion;
  }
  
  /**
   * Checks if year, month, date of two <code>Date</code> objects match.
   * @param first
   * @param second
   * @return
   */
  public static boolean equalDates(Date first, Date second){
    Calendar calFirst = Calendar.getInstance();
    Calendar calSecond = Calendar.getInstance();
    
    calFirst.setTime(first);
    calSecond.setTime(second);
    
    return calFirst.get(Calendar.YEAR) == calSecond.get(Calendar.YEAR) 
        && calFirst.get(Calendar.MONTH) == calSecond.get(Calendar.MONTH) 
        && calFirst.get(Calendar.DAY_OF_MONTH) == calSecond.get(Calendar.DAY_OF_MONTH); 
  }
  
  /**
   * Reset <code>Date</code> object to start 00:00:00 time of the day.
   * @param date
   * @return
   */
  public static Date zeroTimePortionOfADate(Date date){
//    Calendar cal = GregorianCalendar.getInstance(TimeZone.getTimeZone("UTC +0"));
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    cal.set(Calendar.HOUR, 0);
    cal.set(Calendar.MINUTE, 0);
    cal.set(Calendar.SECOND, 0);
    cal.set(Calendar.MILLISECOND, 0);
    cal.set(Calendar.AM_PM, Calendar.AM);
    return cal.getTime();
  }
  
  /**
   * @return the first date in 1970 with millisSinceMidnight added to it 
   */
  public static Date getDateFromTime(long millisSinceMidnight) {
    
    Calendar cal = GregorianCalendar.getInstance(TimeZone.getTimeZone("UTC +0"));
    Date date = new Date();
    date.setTime(millisSinceMidnight);
    cal.setTime(date);
    
    return cal.getTime();
  }
  
  /**
   * Get the last hour, minute, second of the date specified
   * @param date
   * @return
   */
  public static Date endOfDay(Date date) {
    Calendar calendar = CALENDAR;
    synchronized (calendar) {
      calendar.setTime(date);
      calendar.set(Calendar.HOUR_OF_DAY, 23);
      calendar.set(Calendar.MILLISECOND, 999);
      calendar.set(Calendar.SECOND, 59);
      calendar.set(Calendar.MINUTE, 59);
      return calendar.getTime();
    }
  }
  
  /**
   * 
   * @return
   * @see #endOfDay(Date)
   */
  public static Date endOfToday() {
    return endOfDay(new Date());
  }
  
  /**
   * Get the first hour, minute, second of the date specified
   * @param date
   * @return
   */
    public static Date startOfDay(Date date) {
        Calendar calendar = CALENDAR;
        synchronized(calendar) {
            calendar.setTime(date);
            calendar.set(Calendar.HOUR_OF_DAY, 0);
            calendar.set(Calendar.MILLISECOND, 0);
            calendar.set(Calendar.SECOND, 0);
            calendar.set(Calendar.MINUTE, 0);
            return calendar.getTime();
        }
    }
    
  /**
   * 
   * @return
   * @see #startOfDay(Date)
   */    
  public static Date startOfToday() {
    return startOfDay(new Date());
  }    
  
}

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