JetBooking / Exclude posts that are unavailable on check-in and check-out dates

code.php

<?php
add_filter( 'jet-smart-filters/query/final-query', function( $query ) {

	if ( empty( $query['meta_query'] ) ) {
		return $query;
	}

	$store_type = jet_abaf()->settings->get( 'filters_store_type' );

	foreach ( $query['meta_query'] as $index => $meta_query ) {
		if ( isset( $meta_query['key'] ) && ( 'chekin_checkout' === $meta_query['key'] || 'checkin_checkout' === $meta_query['key'] ) ) {
			[ $from, $to ] = $query['jet_booking_period'] = $meta_query['value'];

			unset( $query['meta_query'][ $index ] );

			jet_abaf()->stores->get_store( $store_type )->set( 'searched_dates', $from . ' - ' . $to );

			$hours = jet_abaf()->settings->is_per_nights_booking() ? 24 : 12;

			$exclude_in = jet_abaf()->tools->get_unavailable_apartments( $from, $from + $hours * HOUR_IN_SECONDS );
			$exclude_out = jet_abaf()->tools->get_unavailable_apartments( $to, $to + $hours * HOUR_IN_SECONDS );

			$exclude = array_merge( $exclude_in, $exclude_out );

			if ( $exclude ) {
				$query['post__not_in'] = $exclude;
			}
		}
	}

	return $query;

}, 0);