how to subtract two time variable (sinan

[mrcoma]

Let $time1 and $time2 be two time formatted variables..(hh:mm:ss)

Let $time1>$time2

$time1 - $time2 produces 0..

how should I subtract two time variables..

[bfranco]

you are substracting strings.
You should translate these strings into unix timestamp, and then you will be able to do the substraction:

//Split the strings into hours, minutes and seconds integers
list($h1, $m1, $s1)=explode(':', $time1);
list($h2, $m2, $s2)=explode(':', $time2);

//Get the timestamps
$timestamp1=mktime($h1, $m1, $s1, 0, 0, 0);
$timestamp2=mktime($h2, $m2, $s2, 0, 0, 0);

//Do the substraction
$substract=$timestamp1-$timestamp2;

//Show the result
printf("<h1>The result is %s</h1>\n", strtotime("%H:%M:%S", $substract));