1public function check_time_overlap($start_time1, $end_time1, $start_time2, $end_time2) {
2 return (($start_time1) <= ($end_time2) && ($start_time2) < ($end_time1) ? true : false);
3}
4
5// true: overlap
6// falseL not overlap
1if((StartDate1 <= EndDate2) && (StartDate2 <= EndDate1)) {
2 //overlapping dates
3}