how can i get this to output
HH:MM format?
$to_time = strtotime(\"2008-12-13 10:42:00\"); <--AM
$from_time = strtotime(\"2008-12-14 8:21:00\")
First of all you need to include AM and PM in your date strings, otherwise 2008-12-14 8:21:00 will be interpreted as 8:21 AM
Now the difference between two dates is 2019 that is 33h:19m, you cant' have t with standard date formats, since they support only 24h clock. You should keep $stat as integer, and display it with sprintf like like this:
echo sprintf('%02dh:%02dm', $stat/60, $stat%60);