Problem With Some iPhones
I was working with a friend who had her new Mac lap top. After 2 am Sunday my iPhone jumped back 1 hour (not ahead) and her lap top jumped 3 hours ahead. My PC was correct and we went in opposite directions. It was like we fell into a little time whirl pool.
Her lap top eventually righted itself and my iPhone came back to EST but not DST. My wife's iPhone has no problem but mine I found that I had to turn off the automatic setting then I'm in DST. Turn automatic back on - back to EST.
Talking to other iPhones users at work and I found I was not the only one. I thought it did finally operate correctly in Auto but discovered that it is back to EST not DST.
My wife's iPhone is working but I did find that she has an older OS version and I believe that is the source of the quirk. She has 4.0 (8A293) and I have OS 4.01 (8A306). I'm guessing some small error was introduced in OS 4.01 and probably corrected in a newer version which I haven't bothered to load.
If you have OS 4.01 just turn off automatic. I'm curious if DST will start in the pre 2007 setting (i.e. three weekends from now)
P.S. It is a wide spread problem:
http://osxdaily.com/2011/03/13/iphone-daylight-savings-time-bug-fall-back-instead-of-spring-forward/
BTW: Rebooting as it suggested here did not work for me.