change 24 hour format to 12 hour format

change 24 hour format to 12 hour format

How can I change 24 hour to 12 hour in creator?
 
ex: Zapier value as Appoin =  03/12/2015 11:00:00 PM
    
       when I import in into creator the value is  Appoin = 03/12/2015 11:00:00
  
      The creator value automatically changed into A.M. I want the actual format whether 03/12/2015 11:00:00 PM or  03/12/2015 23:00:00