Now you will be able to give a consistent format to your numbers, for example if you want to create a field type "Time" where you want to store always a number with the same format as 12:03:00, Mask for your numbers is the way to go.
This new feature is available on every Number field already created in your account, navigate to your Form Fields under Apps Setup and edit or create a new "Number" field:
To learn more about the available formats please click on the following link: Numeral