Day format on my invoices has changed to Month/Day/Year, previously it was Day/Month/Year. How can I change it?

Hello there, Burcu. It's could be that your date format setting has been changed inadvertently.

To resolve this, let's navigate to the Advanced settings and switch the date format back to your desired setup.Here's how:

1. Go to the Gear icon and then select Accounts and Settings.
2. Choose the Advanced tab.
3. Scroll down until you find the Other preferences section, then click the Edit
   
4. In the Date format dropdown menu, select your desired format.
5. Click Save, then hit Done to finalize your changes.
   

Feel free to ask if you have more questions about changing the date format in QuickBooks Online. We're here to help.