Add Banner coupon woocommerce into single page, cart and checkout with expiration time

Add Banner coupon woocommerce into single page, cart and checkout with expiration time.php

<?

/**
 * Add Banner coupon woocommerce into single page, cart and checkout with expiration time
 */

function custom_message_before_single_product() {
  global $woocommerce;
  $coupon_code = 'casabella21';  // Coupon
  $c = new WC_Coupon($coupon_code);
  $date_expiration =  strtotime("30-4-2021"); // Data di scadenza
  $today = strtotime("today midnight"); // Data di oggi

 if($today <= $date_expiration && !in_array($coupon_code, $woocommerce->cart->get_applied_coupons())){ ?>
<div class="banner_coupon">Sconto aggiuntivo del <?php echo $c->amount ?>% con il codice:
  <span class="scissors_coupon">✂</span>
  <a href="#" onclick="CopyToClipboard('code_coupon');return false;"><span id="code_coupon"><?php echo $coupon_code ?></span></a>
</div>

<style>
.banner_coupon {
  border: 2px dashed #000;
  text-align: center;
  margin: 0 0 20px 0;
  padding: 2em;
  background: linear-gradient(90deg,rgba(0, 0, 0, 1) 0%,rgba(190, 143, 117, 1) 100%);
  border-radius: 5px;
  color: #fff;
  font-size: 1.2em;
  position: relative;
}

.scissors_coupon {
  position: absolute;
  top: -18px;
  right: 0;
  font-size: 21px;
  color: #000;
}

#code_coupon {
  display: block;
  border: 1px dashed #fff;
  width: 130px;
  padding: 5px;
  margin: 20px auto;
  text-transform: uppercase;
  font-size: 16px;
	color: #fff;
}
</style>
<script>
function CopyToClipboard(id)
{
var r = document.createRange();
r.selectNode(document.getElementById(id));
window.getSelection().removeAllRanges();
window.getSelection().addRange(r);
document.execCommand('copy');
window.getSelection().removeAllRanges();
}
</script>
<?php
} else {
	 return false;
}
}

add_action( 'woocommerce_single_product_summary', 'custom_message_before_single_product', 5 ); // For single product page
add_action( 'woocommerce_before_cart_table', 'custom_message_before_single_product', 10); // For cart page table
add_action( 'woocommerce_before_checkout_form', 'custom_message_before_single_product', 10); // For checkout page
add_action( 'woocommerce_archive_description', 'custom_message_before_single_product', 10 );