is there property of time picker to set so user won’t be able to put hours more than 12 if I have format string includes tt and I won’t be able to input 70 minutes. Its validate after but any property of your control so it won’t be allow for user to select 13 hours and 75 min and put “AA” in time picker. My format string is ‘MM/dd/yyyy hh:mm tt’, so I don’t like that user can put anything more than 12 hr in hours field of time picker. http://jsfiddle.net/guwJh/151/