The contact-form-7 wpcf7 is date hook.
Published Date - July 22, 2023
return apply_filters( 'wpcf7_is_date', $result, $text );
$result
$text
The following example is for adding a hook callback.
// define the wpcf7_is_date callback
function custom_wpcf7_is_date( $result, $text ){
//custom code here
return $result
}
//add the action
add_filter('wpcf7_is_date', 'custom_wpcf7_is_date', 10, 2)
The filter is defined in the following location(s).
contact-form-7/includes/validation-functions.php
return apply_filters( 'wpcf7_is_date', $result, $text );