Contribution graph dates are off by one

Is it just me or did the contribution graph shift by one day? For example, when I hover over Sunday Dec 13, the popup displays Dec 12. Where does one report this if it’s a bug?

I’m having the same issue. If you go and look at past years of contributions, the years start at December 31st and end on December 30th. So the whole calendar is off by one day.

This issue appears to be fixed now.