I just checked and the clock is within a minute of where it should be.
There is an adjustment for time in your PROFILE, as you already discovered. It should show you the system time (in EST) and your computer's clock, with a suggested setting for the box on the right. It's important to save there, and also on the previous screen.
One thing to check is to make sure your Windows has the correct time zone setting. You can verify this by double clicking on the time at the bottom right of the screen. Then click on the TIME ZONE tab.
There are some serious problems with the grumble right now due to a post-dated test message (8/27). Content Islands (last 5 posts, last 5 topics, last visitors, etc) are frozen in time, waiting for something "newer" than 8/27. I suspect when that date passes, the issue will correct itself and the planets will once again be re-aligned.
Mike