Let me share the steps on how to resolve the issue in QuickBooks Desktop, denis211.

First, make sure that QuickBooks is updated to its latest maintenance release. Here's how:

1. Go to the Help menu and select Update QuickBooks Desktop.
2. Proceed to the Update Now tab.
3. Check the box for Reset Update, then click Get Updates.
4. Click Close after getting a confirmation that the update is complete. Then, close and reopen QuickBooks. 
5. Click Install Now when prompted if you want to install an update.

Second, record a trip to check if the dates are saving correctly.

Just in case it's still reverting back to today's date, proceed to repairing QuickBooks. Follow the steps in this article for more details: Repair your QuickBooks Desktop for Windows.

Once done, record a trip to check if it's already working fine. I'd be glad to get back here if you need anything else.