The only reliable way I found to get away with this error is,

1. Click the "User Switcher" icon on the top right corner in the Status bar

2. Click "Login Window...", this will take you to the Lock screen

3. Now login back using your credentials.

The only reason why it might be working is, when you follow above steps you are essentially killing all of your user processes and launching them back once you login back. So the process which is responsible for the timestamp might have been killed and restarted.

Let me know if this is working for you as well, or any better technical explanation.