IPhone iCal bug- appointments suddenly 1 hour off

After 2 days of searching and 1 hour on tech support, I've concluded Apple has a bug with iCal on iPhone that still needs to be addressed.
I realized 2 days ago after missing a scheduled conference call that my iCal appointments on my iPhone (3GS) were all showing 1 hour ahead AFTER March 23 (that FYI did NOT coincide with the recent shift to Daylight Savings Time, which I originally thought could be the culprit).
I'm a seasoned Mac/iPhone user (one of the early adopters of iPhone) and this iCal problem just showed up out of the blue.
I searched Apple Discussions and found other instances of this in recent years, and tried every recommended fix:
--Ensured all time zone settings on Mac and iPhone were correct and matched at EST/New York (general AND iCal)
--Tried toggling time zone support off then on again on iPhone
--Tried turning time zone support on and off, in every conceivable combination, on both Mac and iPhone
--Tried posting new entries on the Mac iCal, but same problem: a new 5pm ET appointment on Mac showed up as 6pm on iPhone
--Rebooted
After an hour of troubleshooting, the tech support person today said the only thing they could suggest is a complete restore of iPhone, NOT using previously stored info-- meaning, among other things, many text messages of sentimental value to me would be lost forever.
Eventually, my Mac iCal entries got messed up too, overridden by the incorrect iPhone ones (fortunately only after March 23).
Ready to give up, I tried changing "bad" appointment times on the iPhone to see if Mac iCal would match them upon sync. THEY DID!
So then I deleted every single appointment on my Mac iCal after March 23, created entirely new appointments (putting correct time for each in the title for every entry in case this happens again), then synched: For now, everything matches.
I've lost about 5 hours on this that I didn't have to spare.
APPLE: PLEASE INVESTIGATE THIS. My iPhone is my "Blackberry"-- I rely on it for work and tell other PC "power users" that it's totally reliable. This has shaken my faith...

bruce1964,
Are your Mac, go to the Date & Time preferences. Is it set to set date and time automatically, and pulling time information from Apple Americas/U.S. Time?
Is the Time Zone correct?
Hope this helps,
Nathan C.

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IPhone iCal bug- appointments suddenly 1 hour off

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