# MD for: https://www.mercadopago.com.uy/developers/es/docs/checkout-pro/additional-settings/expiration-date.md

\# Change expiration date The expiration date represents the maximum deadline to make a payment. With Checkout Pro, you can customize the default expiration date for \*\*offline payments\*\*by using the \`date\_of\_expiration\` field in the preference creation request. > WARNING > > The crediting timeframe is up to 2 business hours depending on the payment method. Therefore, we recommend setting the expiration date at least 3 days apart to ensure payment is made. In addition, if payment is made after the expiration date, the amount will be refunded to the payer's Mercado Pago account. To change the expiration date of an existing preference, send a \*\*PUT\*\* request to the endpoint :TagComponent{tag="API" text="/checkout/preferences/{id}" href="/developers/en/reference/online-payments/checkout-pro/preferences/update-preference/put"}, including the \`date\_of\_expiration\` parameter with the new expiration date and time for the item. 

* [json ](#editor%5F1)
json 

The date uses the ISO 8601 format: yyyy-MM-dd'T'HH:mm:ssz.

```
"date_of_expiration": "2020-05-30T23:59:59.000-04:00"
```

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