How to require a future or past date with Gravity Forms Date Picker
Require dates to be greater than or less than current date (a.k.a. future or past dates).
How to Populate and Modify Dates and Times with Gravity Forms
Populate a Date or Time field with a modified value based on the current date/time or a user-submitted date/time.
Schedule a Post by Date Field with Gravity Forms
Schedule your Gravity Forms generated posts to be published at a future date. The scheduled date can be specified manually in the code or by the submitting user via Gravity Form Date and Time fields.