<?php
add_action( 'woocommerce_checkout_process', 'woofood_holiday_dates_hook', 88888 );
function woofood_holiday_dates_hook() {
global $woocommerce;
$dates = array();
//dates closed//
$dates[] = "2020-12-25";
$dates[] = "2020-12-26";
$dates[] = "2020-12-27";
$date_to_deliver = isset($_POST["woofood_date_to_deliver"]) ? $_POST["woofood_date_to_deliver"] : "";
$date_to_pickup = isset($_POST["woofood_date_to_pickup"]) ? $_POST["woofood_date_to_pickup"] : "";
if(in_array(current_time("Y-m-d"), $dates) || in_array($date_to_deliver, $dates ) || in_array($date_to_pickup, $dates ) )
{
wc_add_notice(
__( 'Sorry, but we are closed for Holidays ', 'woofood-plugin' ), 'error'
);
}
}