When you create a Sale Event for your Etsy shop, you can start the sale at the time you set it up or schedule it to start at a later date and time. Once the sale starts, you have the flexibility to change its End Date and End Time.
To do that, go to your Sale Events page and click on the ‘My Sales Event’ tab. You will then see a list of all your active sales with few action buttons. Click on the ‘Extend’ button and you will see the following options to change the end date and time for the particular sale event.