Close the WooCommerce shop on certain days of the week at a certain time in the day

woocommerce_shop_closed.php

<?php

/* Hire me at webdados.pt for more WooCommerce magic */

//The function that determines if the shop is closed or not
function custom_shop_closed() {
	//Week days closed - ISO-8601 numeric representation of the day of the week - 1 (for Monday) through 7 (for Sunday)
	$week_days_closed = array( 5, 6 ); //Fridays and Saturdays
	//Hours closed
	$min_hour_close = '07:00';
	$max_hour_close = '09:00';
	//Test it
	if (
		in_array( date_i18n( 'N' ), $week_days_closed )
		&&
		date_i18n( 'H:i' ) >= $min_hour_close
		&&
		date_i18n( 'H:i' ) <= $max_hour_close
	) {
		return true;
	}
	return false;
}

//Make products not purchasable
add_filter( 'woocommerce_is_purchasable', function() {
	return !custom_shop_closed();
} );

//Add a store notice
add_action( 'woocommerce_init', function() {
	if ( custom_shop_closed() )
		wc_add_notice( 'Yippee ki-yay - The shop is closed!', 'notice' );
} );