Invoice activity dates are incorrect

I've got the steps to resolve this, @garreth.

This could be a browser-related issue. The stored cache can affect the performance of QuickBooks which can cause unexpected behavior.

To begin, I'd suggest logging in to your QBO account via a private window. This doesn't use the existing cache files, which makes it a good place to determine if there's an issue with the browser. 

Here are the keyboard shortcuts: 

• Safari: Command + Shift + N 
• Google Chrome: CTRL + Shift + N
• Mozilla Firefox or Microsoft Edge: CTRL + Shift + P 

After signing in, verify if the error is fixed. If yes, let's clear the cache of your browser. This helps remove its stored cache to improve the program's performance.

Otherwise, I'd also recommend using different browsers. They'll provide you with the best and most secure experience with QuickBooks. For more details, see this article: System Requirements For QuickBooks.

 Also, you can check the date format in your Account and Settings and make some changes if necessary.

Here's how: 

1. Click the Gear icon, then choose Account and Settings. 
2. Hit the Advanced button. 
3. In the Other preferences, click the Date format. 
4. Modify it, then tap Save. 
5. Tap Done. 

You can also visit this article about how to customize your business settings: Edit company settings in QuickBooks Online. 

I've also added some links below about deposit, matching transactions, and reconciling accounts for additional reference and guide:

• Record and make Bank Deposits in QuickBooks Online
• Categorise and match online bank transactions in QuickBooks Online
• Reconcile an account in QuickBooks Online

If there’s anything else I can help you with, leave a comment below. I’ll jump right back in to assist further. Have a great day ahead, @garreth.