Subtract two times from each other

**Schwalbach** · Oct 25, 2005 17:46

Hey,

I have two times entered into a form, a starting time and an ending time e.g, Start Time: 3:30, End Time: 5:15.

I enter these by hand, so I can enter them like 3.3 and 5.15 or however needed, but what I need to do is minus the end time from the start time to see how long I've worked so I can then see how much I've made per hour or whatnot...

so I would somehow need to be able to minus 3.3 from 5.15 and get the minute difference between the two(5:15-3:30, I would want to get 105 minute difference)

I've looked up strtotime, mktime, etc, but I have no idea how to get the minutes out of unix timestamps so any help would be greatly appreciated...

Thanks a bunch,

**cringer** · Oct 25, 2005 18:38

PHP's time() is measure in seconds

so record time() at the start and record time() at the end.... that will give you the difference in seconds. To get the difference in minutes, just divide by 60.

**Schwalbach** · Oct 25, 2005 18:57

Hey,

I would be entering both at the same time, and would have to enter them manually because like otherwise I don't know how to do it...I would be putting in the starting time, then playing a game for however long I played it, then I would get the ending time, so how would I get each seperately?

Thanks again

**ghurtado** · Oct 25, 2005 22:50

Originally Posted by Schwalbach

I would be entering both at the same time, and would have to enter them manually because like otherwise I don't know how to do it...I would be putting in the starting time, then playing a game for however long I played it, then I would get the ending time, so how would I get each seperately?

Off Topic:

You play games for a living? man, I want your job!

Here is a full working page I whipped up for you to play with:

PHP Code:


<?

$start_time = $_REQUEST['start_time'];

$end_time = $_REQUEST['end_time'];

$action = $_REQUEST['action'];

?>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<html>

<body>

<h3>Parse Times</h3>

<form action="<?= $_SERVER['PHP_SELF'] ?>">

Enter the start time (hours:minutes) 

<input type="text" name="start_time" value="<?= $start_time ?>" size="60"> <br/>



Enter the end time (hours:minutes) 

<input type="text" name="end_time" value="<?= $end_time ?>" size="60"> <br/>

<input type="submit" value="Go!"> <br/>



<input type="hidden" name="action" value="go">

</form>

<hr>



<?

if($action && ($action == "go")){

    list($hours, $minutes) = split(':', $start_time);

    $startTimestamp = mktime($hours, $minutes);

    

    list($hours, $minutes) = split(':', $end_time);

    $endTimestamp = mktime($hours, $minutes);

    

    $seconds = $endTimestamp - $startTimestamp;

    $minutes = ($seconds / 60) % 60;

    $hours = round($seconds / (60 * 60));

    

    echo "Time passed: <b>$hours</b> hours and <b>$minutes</b> minutes";

}

?>

</body>

</html>

**Schwalbach** · Oct 26, 2005 03:40

Wow! Thanks man, I didn't expect that kinda work but that really helps! I will try it out and let you know how it goes...Thanks again!

P.S. I play poker for a living, seems like a game to me because I enjoy doing it, but it gets to be a job because sometimes it can get pretty boring

Thanks again

**Schwalbach** · Oct 26, 2005 03:52

Hey,

I'm getting some kind of problem with it...If I put in 2:15 and 6:30, I get 4 hours and 15 minutes(good to hear!) but if I put in 2:15 and 6:10, I get 4 hrs and 55 minutes, instead of 3 hrs and 55 minutes..

Thanks again

**cringer** · Oct 26, 2005 07:13

Originally Posted by Schwalbach

Hey,

I'm getting some kind of problem with it...If I put in 2:15 and 6:30, I get 4 hours and 15 minutes(good to hear!) but if I put in 2:15 and 6:10, I get 4 hrs and 55 minutes, instead of 3 hrs and 55 minutes..

Thanks again

use floor() to get the hours instead of round().