Remember boys and girls, “spring forward, fall back”. Naturally, your Mac should take care of this transparently without any intervention on your part. However, if you live in Indiana, things are slightly more complicated. It makes my head hurt.
Apple tries to fix that situation as well, but as SchwarzTech points out, you may need choose an alternate city if you use an older OS version.
We have been told that Apple, as of Mac OS X 10.4.5, has changed the settings so that your computer automatically adjusts if your city is “Indianapolis”. People with computers running anything older should just pick will just have to pick another city, such as Columbus, Philadelphia, or New York.
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Our clocks changed last weekend (Saturday night). Sunday morning when I turn on my powerbook (10.4.5) it failed to boot properly. It didn't finish the usual book sequence, getting stuck just before the login screen appears.
I left it for a few minutes, but eventually decided to just turn off the machine manually and try again. The second time it booted fine.
Since I've never had this issue before, or since, I can only assume it had something to do with the change to daylight savings.