$time1 = #שעת סיום#;
$time2 = #שעת התחלה#;

list($hours1, $minutes1) = explode(‘:’, $time1);
list($hours2, $minutes2) = explode(‘:’, $time2);

$total_minutes1 = $hours1 * 60 + $minutes1;
$total_minutes2 = $hours2 * 60 + $minutes2;
$difference_minutes = abs($total_minutes1 – $total_minutes2);

$elapsed_hours = floor($difference_minutes / 60);
$elapsed_minutes = $difference_minutes % 60;

if ($elapsed_hours < 10) {
$elapsed_hours = '0' . strval($elapsed_hours);
}

if ($elapsed_minutes < 10) {
$elapsed_minutes = '0' . strval($elapsed_minutes);
}

return "{$elapsed_hours}:{$elapsed_minutes}";