Hi @Messam 

it might be best to change the control it’s self into a date only control then move the time into 2 separate controls for hours and minutes. 
 

then in the workflow you can add the entered time to the date provided. 
 

this would force users to enter a time and still allow for 12:00 to be a valid choice. 
 

Using validation rules to force a time change will make it so people would not be able to select 12:00 if that is a valid choice, you’ll end up with a lot of 12:01s

Hope this helps

Jake

It’s there any other way this could be achieved, like using a JavaScript? Only reason I am asking is because my form currently have 3 date time fields.