AS3日期工具

package com.evian.utils
{
 public class DateUtil
 {
  public static const MINUTE_IN_MILLISECONDS : Number = 60 * 1000;
  public static const HOUR_IN_MILLISECONDS : Number = 60 * 60 * 1000;
  public static const DAY_IN_MILLISECONDS : Number = 24 * 60 * 60 * 1000;
  public static const WEEK_IN_MILLISECONDS : Number = 7 * 24 * 60 * 60 * 1000;
  public static const MONTH_IN_MILLISECONDS : Number = 30 * 24 * 60 * 60 * 1000;
  public static const YEAR_IN_MILLISECONDS : Number = 12 * 30 * 24 * 60 * 60 * 1000;
  public static const CENTURY_IN_MILLISECONDS : Number = 100 * 12 * 30 * 24 * 60 * 60 * 1000;
  public static const MILLENIUM_IN_MILLISECONDS : Number = 1000 * 100 * 12 * 30 * 24 * 60 * 60 * 1000;
  
  public static function clearTime( date : Date ) : Date 
  { 
   date.date=1;
   date.hours = 0;
   date.minutes = 0;
   date.seconds = 0;
   date.milliseconds = 0;
   
   return date;
  }
  
  public static function copyDate( date : Date ) : Date 
  {
   return new Date( date.getTime() );
  }
  
  public static function setTime( date : Date, time : Number ) : Date
  {
   date.date = Math.ceil(time / (1000 * 60 * 60 *24));
   date.hours = Math.floor(( time / (1000 * 60 * 60)) % 24);
   date.minutes = Math.floor(( time / (1000 * 60)) % 60);
   date.seconds = Math.floor(( time / 1000) % 60);
   date.milliseconds = Math.floor( time % 1000); 
   
   return date;
  }
  
  public static function addTime( date : Date, time : Number ) : Date 
  {
   date.milliseconds += time;
   
   return date;
  }
  /**
   * format to 00:00:00
*/
  public static function formatTimeString(hours:int,minutes:int,seconds:int):String
  {
   var h:String="";
   var m:String="";
   var s:String="";
   
   h=hours>9?hours.toString():"0"+hours.toString();
   m=minutes>9?minutes.toString():"0"+minutes.toString();
   s=seconds>9?seconds.toString():"0"+seconds.toString();
   
   return h+":"+m+":"+s;
  }
  /**
   * format to 00:00
*/
  public static function formatTimeToHour(hours:int,minutes:int,seconds:int):String
  {
   
   var m:String="";
   var s:String="";
   
   minutes+=hours*60;
   m=minutes>9?minutes.toString():"0"+minutes.toString();
   s=seconds>9?seconds.toString():"0"+seconds.toString();
   
   return m+":"+s;
  }
  /**
   * @param seconds 秒
   * format to 00:00:00
*/
  public static function formatTimeToString2(seconds:int):String
  {
   var hour:int=seconds/3600;
   var minutes:int=seconds/60%60;
   var scecond:int=seconds-hour*3600-minutes*60;
   
   return formatTimeString(hour,minutes,scecond);
   
  }
 }
}