See this thread with a screen shot
https://community.quicken.com/discussion/7864614/date-displaying-in-wrong-format
bobspunkin said: Hi, my Windows date format is 4/22/2020. So how would changing the date format in Windows help me in Quicken? Thanks for your answer though.
If you haven't rebooted Windows since you installed the latest software update, please do so now and then try Quicken again.
Still not working?
Let's try some "Troubleshooting 101" to ensure the Quicken software is installed and updated properly and that your data file is in good working order. Please perform all the steps in this document in the order specified:Troubleshooting 101 - Fixing Software Installation and Data File Problems