gp-unique-id-date-specific-sequences.php

<?php
/**
 * GP Unique ID // Gravity Perks // Date-specific Sequences
 * http://gravitywiz.com/
 *
 * Requirements:
 * - Your form ID cannot be more than 3 digits.
 * - Your field ID cannot be more than 2 digits.
 */
// Update "123" to your form ID. Update "4" to your Unique ID field ID.
add_filter( 'gpui_unique_id_attributes_123_4', function( $atts, $form_id, $field_id ) {

	// Generates a unique sequence identifier based on current date.
	$atts['form_id'] = date( 'mdy' );

	// Add additional support for uniquely identifying this sequence by form and field.
	$atts['field_id'] = substr( $form_id, 0, 3 ) . substr( $field_id, 0, 2 );

	return $atts;
}, 10, 3 );