The date format configuration is linked to the language that you use.

If you are seeing the month first (MM/DD/YYYY) you are most likely using English (US) and would need to change to English (UK) should you wish to have the day first (DD/MM/YYYY).

It's worth mentioning that changing this would also change the day that your calendar starts on, but only on the business dashboard, not for the customers.
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If you are looking to change the starting day of the week for your customers' calendars, see here.

To change language, please scroll to the bottom of your TeamUp page >> locate the language selector >> select English (UK) >> Save.

You should now notice that the date format has changed to DD/MM/YYYY.