[PHP] Re: Time Processing From: A. R. M. (amojahed <email protected>)
Date: 10/14/01

Hi,

As I said, PHP doesn't seem to have enough built-in functions to process
time values.
So, I wrote my own functions to deal with times and I'm posting them here
for either inclusion, or for other people's use.

Here they are. Enjoy.
=====================

<?php
function CheckTime($t) {
/* Checks the value of a 24-hour formatted time to be correct.
   Returns 0 if bad time format, 1 otherwise.
*/
   return ( ereg("[012][0-9]:[0-5][0-9](:[0-5][0-9])?", $t) );
}

function TimeToUnixTime($t) {
/* Takes a time in HH:MM:SS format and returns a unix time (or number of
   seconds) since Jan 1, 1970 (UNIX epoch).
   Returns 0 if the format is incorrect.
*/

   if ( !CheckTime($t) )
        return (0);

   $time = explode (":", $t);
   return ( mktime($time[0], $time[1], $time[2], 1, 1, 1970) - 18000);
/* I have no idea why mktime behaves this way, but I had to deduct 5 hours
   to make it work right. As if it's returned in GMT.
*/
}

function SumTimes($t1, $t2) {
/* Takes two times in HH:MM:SS format and returns the sum.
   Returns 0 if task is not possible.
*/

   if ( !CheckTime($t1) || !CheckTime($t2) )
        return (0);

   $time1 = explode (":", $t1);
   $time2 = explode (":", $t2);

   $h = $time1[0] + $time2[0];
   $m = $time1[1] + $time2[1];
   $s = $time1[2] + $time2[2];

   while ( $s > 59 ) {
        $m++;
        $s -= 60;
   }

   while ( $m > 59 ) {
        $h++;
        $m -= 60;
   }

   return ( sprintf("%02d:%02d:%02d", $h, $m, $s) );

/* another method is to use date() and mktime() instead of all the above, like this:
   return( date("H:i:s", (TimeToUnixTime($t1) + TimeToUnixTime($t2) + 18000)) );
*/
}

function DiffTimes($t1, $t2) {
/* Takes two times in HH:MM:SS format and returns the difference.
   $t1 must be less than $t2. Returns 0 if task is not possible.
*/

   if ( !CheckTime($t1) || !CheckTime($t2) )
        return (0);

   $time1 = explode (":", $t1);
   $time2 = explode (":", $t2);

   $h = $time2[0] - $time1[0];
   $m = $time2[1] - $time1[1];
   $s = $time2[2] - $time1[2];

   while ( $s < 0 ) {
        $s += 60;
        $m--;
   }

   while ( $m < 0 ) {
        $m += 60;
        $h--;
   }

   return( sprintf("%02d:%02d:%02d", $h, $m, $s) );
}
?> 

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