Determine difference between two times

kaotik78

Hello again all,

I've come to a crossroads yet again, where spending hours trying to figure something out has led me to ask for help.

I am trying to take a start time and end time and find the difference between the two values.

I have a form that submits start time and end time. When you enter, say 1:30 as a start time, and 2:45 as a end time, the result should be 1:15.

I have tried date, explode, and strtotime all with no luck. I thought this was going to be a easy one, I was very wrong...

My code

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$start = explode(":", $_GET['begin']);

$start_hour = $start[0];

$start_minute = $start[1];
 
$end = explode(":", $_GET['end']);

$end_hour = $end[0];

$end_minute = $end[1];
 
$result_minutes = $end_minute - $start_minute;

$result_hours = $end_hour - $start_hour;
 
echo $result_hours . ":" . $result_minutes . "<Br>";

Atli

Hi.

You could do something like this:

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<?php

    $start = strtotime("12:00");

    $end = strtotime("14:00");

    $elapsed = $end - $start;

    echo date("H:i", $elapsed);

?>

But this is a flawed method. Consider what would happen if the start time was "23:00" and the end time was "1:00"... You would end up with "-22:00"

I would recommend using the time() function to record the start and end times. It would make this much more accurate.

brettl

Look at the mktime(). I used the code below to get the difference from today's date and another date. You'll have to break apart your start time and end time and use mktime and do a little math..... Hope this helps.

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$today=time();

    $pubdate="2007-09-24T07:02:14Z";

    $year = substr($pubdate, 0, -16);

    $month = substr($pubdate, 5, -13);

    $day = substr($pubdate, 8, -10 );

    $hour = substr($pubdate, 11, -7 );

    $minute = substr($pubdate, 14 , -4);

    $second = substr($pubdate, 17, -1);

    $newpubdate = mktime($hour, $minute, $second, $month, $day, $year);

    $difference = $today - $newpubdate;

      echo 'Date: ';

      echo floor($difference / 84600);

      $difference -= 84600 * floor($difference / 84600);

      echo ' days, ';

      echo floor($difference / 3600);

      $difference -= 3600 * floor($difference / 3600);

      echo ' hours, ';

      echo floor($difference / 60);

      $difference -= 60 * floor($difference / 60);

      echo ' minutes, and'. $difference.' seconds ago.';

Determine difference between two times

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