PHP中对日期操作的函数功能强大，下面的代码是PHP对日期加减的类，很不错，有需要的朋友可以用一下。
如何使用这个类呢？请看下面的演示：

1. $temptime  = time();   
2. echo   strftime (  "%Hh%M %A %d %b" , $temptime );   
3. $date  =  new  DateAccount();   
4. $temptime  =  $date ->DateAdd( "n"  ,50, $temptime );   
5. echo   "<p>" ;   
6. echo   strftime (  "%Hh%M %A %d %b" , $temptime );   

$temptime = time(); echo strftime( "%Hh%M %A %d %b",$temptime); $date = new DateAccount(); $temptime = $date->DateAdd("n" ,50,$temptime); echo "<p>"; echo strftime( "%Hh%M %A %d %b",$temptime);
如果一切顺利，你可以看到以下结果：
15h41 Saturday 03 Jun
16h31 Saturday 03 Jun

1. $currenttime  = time();   
2. echo   "Current time: " .  strftime ( "%Hh%M %A %d %b"  , $currenttime ). "<br>" ;   
3. $date  =  new  DateAccount();   
4. $newtime  =  $date ->DateAdd ( "n" ,50 , $currenttime );   
5. echo   "Time plus 50 minutes: " .  strftime ( "%Hh%M %A %d %b"  , $newtime ). "<br>" ;   
6. $temptime  =  $date ->DateDiff ( "n" , $currenttime  , $newtime );   
7. echo   "Interval between two times: " . $temptime ;   

$currenttime = time(); echo "Current time: ". strftime("%Hh%M %A %d %b" ,$currenttime)."<br>"; $date = new DateAccount(); $newtime = $date->DateAdd ("n",50 ,$currenttime); echo "Time plus 50 minutes: ". strftime("%Hh%M %A %d %b" ,$newtime)."<br>"; $temptime = $date->DateDiff ("n",$currenttime ,$newtime); echo "Interval between two times: ".$temptime;
如果一切顺利，你可以看到以下结果：
Current time: 16h23 Saturday 03 Jun
Time plus 50 minutes: 17h13 Saturday 03 Jun
Interval between two times: 50

1. <?php   
2.   class  DateAccount{   
3.       function  __construct(){   
4.      }   
5.       
6.       function  DateAdd ( $interval , $number ,  $date ) {   
7.          $date_time_array  =  getdate ( $date );   
8.          $hours  =  $date_time_array [ "hours" ];   
9.          $minutes  =  $date_time_array [ "minutes" ];   
10.          $seconds  =  $date_time_array [ "seconds" ];   
11.          $month  =  $date_time_array [ "mon" ];   
12.          $day  =  $date_time_array [ "mday" ];   
13.          $year  =  $date_time_array [ "year" ];   
14.          switch  ( $interval ) {   
15.            case   "yyyy" :  $year  += $number ;  break ;   
16.            case   "q" :  $month  +=( $number *3);  break ;   
17.            case   "m" :  $month  += $number ;  break ;   
18.            case   "y" :   
19.            case   "d" :   
20.            case   "w" :  $day += $number ;  break ;   
21.            case   "ww" :  $day +=( $number *7);  break ;   
22.            case   "h" :  $hours += $number ;  break ;   
23.            case   "n" :  $minutes += $number ;  break ;   
24.            case   "s" :  $seconds += $number ;  break ;   
25.         }   
26.          $timestamp  =  mktime ( $hours  , $minutes ,  $seconds , $month  , $day ,  $year );   
27.          return   $timestamp ;   
28.    }   
29.      
30.     function  DateDiff ( $interval , $date1 , $date2 ) {   
31.          $timedifference  =  $date2  -  $date1 ;   
32.          switch  ( $interval ) {   
33.            case   "w" :  $retval  =  bcdiv ( $timedifference  ,604800);  break ;   
34.            case   "d" :  $retval  =  bcdiv (  $timedifference ,86400);  break ;   
35.            case   "h" :  $retval  =  bcdiv  ( $timedifference ,3600);  break ;   
36.            case   "n" :  $retval  =  bcdiv (  $timedifference ,60);  break ;   
37.            case   "s" :  $retval  =  $timedifference ;  break ;   
38.         }   
39.          return   $retval ;   
40.     }   
41.  }   
42. ?> 
    

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