QUOTE
If the clock is set to check with a network time server, it should match the thing whether DST is checked or not, shouldn't it?
The Time server doesn't tell your computer what time it is in your time zone. Nor does it tell it that DST is in effect. It simply tells it the time in Greenwich, England, what used to be called Zulu time. Your computer ( whether Mac or PC must then determine from the stored date and the stored database in it
and your setting for DST updating, whether to change the
displayed time or not. The recent updates from Apple ( as well as most other computer and OS makers ) is to update that database since the law in the US changed this year. But, that same database includes the rest of the known universe, also. I know it's hard to believe, but there are other countries, even in this World and they may not use the same time periods for DST. That's why the Time settings ask you to tell it where ( in the world ) you'll be using the computer.
If you change the time manually
and you leave the DST settings enabled, you'll get another time change when the old database is accessed because it doesn't know the law changed. For all it knows, you just changed the time because you moved to another time zone.
So, your choices are:
1. Update that database
2. Disable automatic DST and change the time yourself
3. Use a granular silicon-based, gravity powered time keeping device
Without changing the local time, some programs
may get confused by the 'time stamps' ( usually GMT ) that indicate that the file/doc is created in the 'future'.