It seems to me that this should echo 11 hours but it returns 12; what am I missing?
$start_time = "06:00";
$end_time = "17:00";
$LOD = date("H:i", ((strtotime($end_time) - strtotime($start_time))));
echo "Length of day: " . $LOD . " hours";
Update: running on my MBPro in a MAMP environment; system time set to 24 hr.