gravity forms time slots
How to automatically close a Google Form at a certain time (5 ...
But, one feature that Google Forms lacks natively is the ability to set time limits. Fortunately, there are Google Forms add-ons that can solve this issue.
How to set time limits in Google Forms | The Jotform Blog
If you want to be able to block out time slots that clients have already selected, you can download an add-on for Google Forms called Choice Eliminator to avoid double-booking appointments.
Current Time Merge Tags in Gravity Forms
Enhance date and time functionality in Gravity Forms with the DateTime Field Add-On. ... A date-time add-on for Gravity Forms with "custom date time" format ...