Hello,
What time zone are you in, and what is your server's time zone?
This most often happens when someone is in a different time zone from their server. For whatever reason, the daily sign in is set to local time. The daily sign in calendar will roll over to the next month but be listed as everything having been completed. If this is your issue, you can get around it by logging in while it is the correct day both in your server and in your real time zone. You should also be able to get around this issue by manually adjusting your computer's time to that of your server.

Thanks!