A simple and nice plugin to add date restrict dynamically in gravity forms default date picker field. If the installation is okay, go to gravity forms dashboard. Add a date field on your form. Open date field and you will see to Enable Restrict date options checkbox. Click that checkbox and configure as you want. And save form. You're done!
Requirements
- PHP 5.6
- Gravity Forms 2.4 or 2.5
Installation is fairly straight forward. Install it from the WordPress plugin repository.