How to prevent user from back dating the form?

I have used the date picker as a creation date for a form. I do not want the user to back date the form. As the form moves through the approval conditions this could take a couple of days. The people approving are being stopped due to date being older that the current date of approval. What is the work around?

You can disable the past dates as explained in the guide. Please also let us know which form are you referring to.