On the Edit Count page (Here's my example), there's a box labelled "Time Card". It has a diagram of the time of day and day of the week that I've edited Wikipedia. It also has a checkbox labelled "Use local time instead of UTC". When this checkbox is unticked, the times and days are in UTC and are accurate. However, when the checkbox is ticked, the times are accurate but the days are not. For example, as I write this, I have 53 edits at 21:00 UTC on Thursdays. When I tick the checkbox, the 53-edit circle slides to 10:00 NZDT on Thursdays, even though it should be 10:00 NZDT on Fridays.
