The forum has been set to reflect the end of daylight time. Individual users do not need to do anything, except for a few of you.
Using a query of the user account database, I noticed that around half the users were set to use the -9 timezone, which is AKST (Alaska time), and around a quarter of users were set to use JST (Japan time). I think this was an unintentional effect of our conversions from previous forum software (phpbb for the users on AKST, and whatever forum software we had in 2004 for JST), because the pattern followed such that accounts were largely set to those time zones based on what forum software was in use when those accounts were created. Maybe the forum admin in 2004 set the server to Japan time? (Who knows...) I've set all these users to use PST now. Those few of you who were actually intentionally using AKST or JST, well, you'll have to set it back, sorry.
If you were using any other time zone in the world, it has remained as-is. (We do have a handful of users from just about every time zone in the world!)
If your country does not use DST at all, or does so on different dates than the US, you'll have to change it manually. In fact, you'll have to change it manually twice a year if you don't use DST, or four times a year if you do, but on different dates! (Sorry, our forum software, SMF, doesn't appear to support choosing the time zone with its rules, which could make it automatic. It only supports setting an hour offset. Which also means if you live in India, you're out of luck, since it uses a half hour offset.) We do it this way because, of course, the vast majority of our users are in the Pacific time zone.
You can change your "time zone" (hour offset) in your forum profile.