When a month ends on a Wednesday (in Europe), then you will be able to see a reset on Thursday as well. This happens because a visual bag in the in-game calendar. However, if you look your calendar after the Wednesday's reset, the reset on Thursday should not be there any more.

Just putting that out here so people know and don't get saved.

source

Thanks hangers, I am not winkle so don't get locked on every character but I was confused by the calendar.