time calculation

[stuartc1]

I was wondering if you have any ideas for the following problem.
I am looking to find out the hours and minutes between two times (09.15 and 12.00 = 2hours 45 minutes) but if you use 12.00 - 09.15 you get 2.85.

any ideas would be very helpfull.
SC:

[Anon]

Obviously, since times are base-60 and decimal numbers are base 10...

$begin='9.15';
$finish='12.00';

$begin=explode('.',$begin);
$finish=explode('.',$finish);

$begin = 60$begin[0]+$begin[1];
$finish = 60$finish[0]+$finish[1];

if($finish<$begin) $finish+=60*24; // must mean tomorrow?

$duration=$finish-$begin;
$hours=intval($duration/60);
$minutes=$duration%60;
echo "$hours.$minutes";

[stuartc1]

Thanks a lot Grumbler.

[Anon]

No problem, but I should warn you that what I wrote is hardly bulletproof! For that a time/date-manipulation class should be considered.

[dageek]

Obviously, since times are base-60 and >decimal numbers are base 10...

$begin='9.15';
$finish='12.00';

$begin=explode('.',$begin);
$finish=explode('.',$finish);

$duration = date("H:i", (mktime($finish[0],$finish[1],0,0,0,0)-mktime($begin[0],$begin[1],0,0,0,0));

echo $duration;

This could easy be altered to contain days,months,years.

DaGeek 🙂

[dageek]

Just tested this... No luck...

$duration = date("H:i", (mktime($finish[0],$finish[1],0,0,0,0)-mktime($begin[0],$begin[1],0,0,0,0));

should be :

$duration = date("H:i",(mktime($finish[0],$finish[1])-mktime($begin[0],$begin[1]));

echo $duration;

DaGeek 🙂

[Anon]

Hmm. What if it starts at 23:30 and finishes at 4:45?

[stuartc1]

thank for all your help, here is what I have came up with, it seems to work so far:

function CorrectMinutes($time1, $time2)
{
$t2ar = explode(".", $time2);
$t2hh = $t2ar[0];
$t2mm = $t2ar[1];

			$t1ar = explode(".", $time1);
			$t1hh = $t1ar[0];
			$t1mm = $t1ar[1];

			$hh = $t2hh - $t1hh;
			 if ($t2mm>=$t1mm)
			 		{
					 $mm = $t2mm - $t1mm;
					}
			else
					{
					$mm = "60" - $t1mm;
					$hh = $hh -1;
					}
			 $out1 = $hh . "." . $mm;
			 $out2 = $out1*60;
			 return $out2;
			 }