Display Estimated Delivery Date Range

/**
 * Snippet Name:     Display Estimated Delivery Date
 * Snippet Author:   coding-bunny.com
 * Description:      Displays an estimated delivery date range on the WooCommerce product page based on the day of order.
 */

add_action( 'woocommerce_after_add_to_cart_button', 'cb_estimated_delivery' );

/**
 * Displays estimated delivery date based on current day of the week.
 */
function cb_estimated_delivery() {
    // Set timezone to Rome
    date_default_timezone_set( 'Europe/Rome' );
    
    // Get today's date and the day of the week (1 = Monday, 7 = Sunday)
    $current_date = strtotime('today');
    $day_of_week = date('N', $current_date);
    
    // Calculate estimated delivery range based on the day of the week
    switch ($day_of_week) {
        case 1: // Monday
            $delivery_min = strtotime('+2 days', $current_date);
            $delivery_max = strtotime('+3 days', $current_date);
            break;
        case 2: // Tuesday
            $delivery_min = strtotime('+2 days', $current_date);
            $delivery_max = strtotime('+3 days', $current_date);
            break;
        case 3: // Wednesday
            $delivery_min = strtotime('+2 days', $current_date);
            $delivery_max = strtotime('+5 days', $current_date);
            break;
        case 4: // Thursday
            $delivery_min = strtotime('+4 days', $current_date);
            $delivery_max = strtotime('+5 days', $current_date);
            break;
        case 5: // Friday
            $delivery_min = strtotime('+4 days', $current_date);
            $delivery_max = strtotime('+5 days', $current_date);
            break;
        case 6: // Saturday
            $delivery_min = strtotime('+3 days', $current_date);
            $delivery_max = strtotime('+4 days', $current_date);
            break;
        case 7: // Sunday
            $delivery_min = strtotime('+2 days', $current_date);
            $delivery_max = strtotime('+3 days', $current_date);
            break;
    }
    
    // Format dates in 'day name day month' format and convert to lowercase
    $delivery_min_formatted = strtolower(date_i18n( 'l j M', $delivery_min ));
    $delivery_max_formatted = strtolower(date_i18n( 'l j M', $delivery_max ));
    
    // Output estimated delivery date range
    echo '<div class="estimate-delivery">';
    echo '<i class="fa-solid fa-truck-fast"></i>';
    echo '<span> Receive it between </span>';
    echo '<span><strong>' . esc_html($delivery_min_formatted) . '</strong></span>';
    echo '<span> and </span>';
    echo '<span><strong>' . esc_html($delivery_max_formatted) . '</strong></span>';
    echo '</div>';
}