Hello Dom,

Welcome to the QuickBooks Community. It's essential you're able to adjust your date format in QuickBooks and I'll be happy to share more info. 

Since there isn't an option to change the date format within QuickBooks, the program uses the date format that's on your computer system. This means in order to change the date format in QB, you'll have to adjust the one on your computer. 

Let me know if you have additional questions. I'll be a message away in case you need anything else.