Date/time picker validate time slot not empty

Hi everyone,

I have an issue which is when i use date/time picker element bubble standard, i use date and time to book various appointments but i when i want to do data validation i cannot check is my time slot is empty. 1) because when a date is enter it is entered with the default time UTC and when I make a validation on date, it only work on the date field and not on the time field. ( I use both field on my page). Can anyone please help me figure out how to ensure a valid time has been picked and therefore not empty (00:00 UTC). I tried to test if the time is (12:00am) but nothing does it! I well stuck here. Thanks a lot for any help!!