18+ validation on datepicker field

In case a datepicker with the “date_of_birth” meta-name selects the birth date, this field makes sure that the user is 18+.

add_filter( 'wppb_check_form_field_datepicker', 'wppbc_custom_18_birthdate_validation', 20, 4 );
function wppbc_custom_18_birthdate_validation( $message, $field, $request_data, $form_location ){
    if( $field['field'] == 'Datepicker' && $field['meta-name'] == 'date_of_birth' ){
        if ( isset( $request_data[$field['meta-name']] ) && trim( $request_data[$field['meta-name']] ) != '' ){
            $input = $request_data[$field['meta-name']];

            $birthdate = new DateTime($input);
            $today   = new DateTime('today');
            $age = $birthdate->diff($today)->y;

            if( $age < 18 ) {
                return 'You need to be at least 18 years old to register for our website.';
            }
        }
        if ( ( isset( $request_data[$field['meta-name']] ) && ( trim( $request_data[$field['meta-name']] ) == '' ) ) && ( $field['required'] == 'Yes' ) ){
            return wppb_required_field_error($field["field-title"]);
        }
    }

    return $message;
}

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