Fatal error: Uncaught Error: Call to undefined function dateDiff() in D:\xampp\htdocs\_0\06_Hotel\southgateinn\SouthGateInn\bookAroom.php:26 Stack trace: #0 {main} thrown in D:\xampp\htdocs\_0\06_Hotel\southgateinn\SouthGateInn\bookAroom.php on line 26