I know that I mention this every year, but sooner or later they'll end up fixing this on the website and I won't have to bring it up.
You may have set your timezone last month when you created / updated your profile, but the site doesn't recognize daylight savings time, so it is probably off by an hour now. Check your profile settings and adjust if needed. This isn't something that you want to find out about at 11:30pm on the 30th when you go to put in the final word count updates, only to discover that the month has ended already for you!
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