We date them to American time for very silly reasons. This started happening because we would write patch notes during the evening, then there would be delays due to some last minute issue and it ended up bleeding into the next date. Now we intentionally date them to American time. This works better with the work schedule of the core technical development team where we release around midnight, sometimes before, most of the times much later. (Our messed up schedules are also convenient right now as it means that we can reach our American partners any time, so we don't have much incentive to fix them though we'll try to do that in the future). That way we get patches for days 11th, 12th, 13th, 14th that each correspond to a day of work instead of something like 11th, 11th, 13th, 13th. The neater dates make more sense in retrospect, and personally I'd like to be able to look back and see that we have released a substantial patch every day for however long and at least the date makes sense for half of the community. Hope you won't mind this eccentricity :)