how to calculate time differnece...

[Anon]

Hello....
i hav resolved that problem by subtracting the offset.so i can get the time as per our standards.The following does this:
function convertGMT($t,$gmtOffset) {
// $timestamp = time();
// $gmtOffset = 5;
$h = $gmtOffset * 3600;
$t = $t - $h;
$d = date("F d, Y h:i a", $t);
return $d;
}
now just tell me if we have two times in the format say 2.34 and 2.56 how should i calculate the diffrence.merely subtracting gives the result as 0.using the above function itself how should i subtract the time to get exact minutes or hours between the two given times in the above format.
coz i have to calculate the elapsed time between login and logout.
please help me in this regard..
bye...
thanx in advance...
Reena

[dolce]

Here is a small idea of mine, how to do that, this function will return you the difference between the times IN SECONDS, all you have to do, is convert this to whatever value you need:

the trick is to get NOT THE VALUES RETURNED BY DATE() but VALUES RETURNED BY TIME()... and simply get the difference between the two timestamps...

<?

//$logout and $login are timestamps obtained either with time() or mktime()

function timeDiff($logout,$login){
$toreturn = $logout - $login;
return $toreturn;
}

//to get something nice out of this time, u do this

function makeItNice($temp){
$secondsleft = $temp % 60;
$minutes = round($temp / 60);
$minutesleft = $minutes % 60;
$hours = round($minutes / 60);
$hoursleft = $hours % 24;
$days = round($hours / 60);
$toreturn = $days . " days and " . hoursleft . ":" . $minutesleft . ":" . $secondsleft;
return $toreturn;
}
?>

[rbohac]

Using round may give you an extra hour or minute depending on the fraction..

Using floor() instead of round() fixes this