Thanks for reaching out to us here. QuickBooks is a powerful program that enables you to manage your work with peace of mind. I'll be happy to share more info so you're on the right track with your work.
QuickBooks Desktop uses the date format on your desktop. I recommend adjusting your date format on your computer. Once you've done that, QuickBooks will follow the new date format on your computer. I encourage you to give this a try and let me know how you make out. I'll be one message away in case you have other questions.