WooCommerce Bookings: Bookings date based coupon

booking_date_coupon.php

<?php
/**
 * Booking Date-Based Coupon Rules
 * 
 * Define which coupons are valid for which booking date ranges.
 * Just edit the $coupon_rules array below.
 */

add_filter( 'woocommerce_coupon_is_valid', function( $valid, $coupon, $discount ) {
	if ( ! $valid || ! WC()->cart ) {
		return $valid;
	}

	// ============================================
	// DEFINE YOUR COUPON RULES HERE
	// ============================================
	$coupon_rules = array(
		// Coupon code => array( 'from' => 'YYYY-MM-DD', 'to' => 'YYYY-MM-DD' )
		'MARCH2026'   => array( 'from' => '2026-03-01', 'to' => '2026-03-31' ),
		'SUMMER2026'  => array( 'from' => '2026-06-01', 'to' => '2026-08-31' ),
		'SPRING2026'  => array( 'from' => '2026-03-20', 'to' => '2026-06-20' ),
		// Add more coupons here...
	);

	$coupon_code = strtoupper( $coupon->get_code() );
	if ( ! isset( $coupon_rules[ $coupon_code ] ) ) {
		return $valid; // No rules for this coupon
	}

	$rules = $coupon_rules[ $coupon_code ];
	$from_date = strtotime( $rules['from'] );
	$to_date = strtotime( $rules['to'] );

	foreach ( WC()->cart->get_cart() as $cart_item ) {
		if ( empty( $cart_item['booking']['_start_date'] ) ) {
			continue; // Not a booking product
		}

		$booking_start = strtotime( date( 'Y-m-d', $cart_item['booking']['_start_date'] ) );

		if ( $booking_start < $from_date || $booking_start > $to_date ) {
			wc_add_notice( sprintf(
				'Coupon "%s" is only valid for bookings between %s and %s.',
				$coupon->get_code(),
				date( 'M j, Y', $from_date ),
				date( 'M j, Y', $to_date )
			), 'notice' );
			return false;
		}
	}

	return $valid;
}, 10, 3 );