Iconic WDS - Remove dates after a certain date.

functions.php

<?php
/**
 * Iconic WDS - Remove dates after a certain date.
 *
 * @param array  $available_dates The available dates.
 * @param string $format          The format.
 * @param bool   $ignore_slots    Ignore slots.
 *
 * @return array
 */
function iconic_wds_remove_dates_after_date( $available_dates, $format, $ignore_slots ) {
	// if date is more than 31st of december 2024, remove it.
	$max_date = new DateTime( '2024-12-31' );
	foreach ( $available_dates as $key => $date ) {
		if ( 'array' === $format ) {
			$date = DateTime::createFromFormat( 'Ymd', $date['ymd'] );
		} else {
			$date = DateTime::createFromFormat( $format, $date );
		}

		if ( $date > $max_date ) {
			unset( $available_dates[ $key ] );
		}
	}

	return $available_dates;
}
add_filter( 'iconic_wds_available_dates', 'iconic_wds_remove_dates_after_date', 10, 3 );