"Hour:Minute" difference from two "Hour:Minute" strings

Question

Simple, eh? -sigh-

A function. Two string arguments ( I guess it doesn't matter the type). Returning a string which is the time difference between the arguments. Think about it as a counter at your local CS internet-caffe.

function time_diff($start, $stop) {
    ...
    return $diff;
}

echo "Your time playing CS: " . time_diff('19:37', '00:05') . ". Go home!";

I tried. Just too embarrassed to say how much time I've invested in this algorithm. I can't change the format (tell me about it!).

If you happen to know a class, a file or a piece of code from the depths of the internets, I'd be happy to make use of it.

"Thanks" you very much.

Answer 1

You can't do this correctly unless you know:

• The timezone.
• The day associated with those times.

Once you know that, you can do:

date_default_timezone_set('timezone here');
$seconds_diff = strtotime("2010-08-29 $end") - strtotime("2010-08-29 $start");