It’s that time of year– the time when summer time, or “Daylight Saving Time” as we for some reason call it in the USA– is ending. There have been various ideas about using a single global time zone, but that just ends up reinventing zones in a new guise (instead of tracking what time it is in different places, you end up needing to know what time the day starts in different places). If you need to calculate dates in a different time zone, use [NS]Calendar and tell it what time zone to use.