How to set a WooCommerce coupon to expire on a fixed date
You may have noticed that the WP Optin Wheel settings only allow to expire coupons X hours, minutes or days from the time it was won. If you don’t want that but you rather want all coupons to expire on a fixed date, you can add a piece of PHP code to your functions.php file:
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In the example above, all generated coupons will expire on May 31st, 2022. Make sure to change both occurrences of 31 May 2022 to the date you need.