Restricting Days in Gravity Forms Datepicker
How can I restrict dates in date picker, to force a choice between 3 and 30 days?
Assuming your form ID is 1 and your date field ID is 4, add an HTML field in the form with this script:
<script type="text/javascript"> gform.addFilter( 'gform_datepicker_options_pre_init', function( optionsObj, formId, fieldId ) { if ( formId == 3 && fieldId == 9 ) { optionsObj.minDate = '+1 D'; optionsObj.maxDate = '+30 D'; optionsObj.beforeShowDay = function(date) { var day = date.getDay(); return [day != 0,'']; } } return optionsObj; } ); </script>
More infos about ACF date field.
Another solution is to use a plugin like Gravity Wiz.