// even if $minutes is negative.
static function toAbsDuration($minutes){
$hours = (string)((int)abs($minutes / 60));
$mins = (string)(abs($minutes % 60));
// even if $minutes is negative.
static function toAbsDuration($minutes){
$hours = (string)((int)abs($minutes / 60));
$mins = (string)(abs($minutes % 60));