All-day iCal events made on iPhone sync to Mac as one day late.

Had this problem a little while now, can't remember what started it, but it hasn't always been like this. I remember first being aware of it near the end of last year because I wondered if the problem might correct itself once 2011 began.
If I create an all-day event on the iPhone calendar, it will sync to the mac's iCal as being one day later. If I enter an event on my phone that's all day, Saturday the 5th of March, it will show up on my computer as Sunday the 6th.
Events which are not "all-day" are completely unaffected.
Both devices are set to the same time zone, with the iPhone having timezone support on and the mac having timezone support off. I've toyed with trying different combinations of these settings but nothing changes. I have to manually drag the mac iCal events one day earlier once they're synced. This fixes it, because it doesn't appear to then bump the iPhone copy of the event any earlier.
But that's a massive pain and I've lost faith in iCal as a timekeeping device. Anything glaringly obvious that I've missed?

I have this problem too. I have an iPhone 4, and this wasn't a problem when I bought the phone back in December. I think it came a month or so later and I suspect with a standard upgrade of something like itunes, or iphone software... but I can't pinpoint it to any specific update as it took me a while to notice it. For me, it does this with my work calendar which is run through Microsoft Outlook. But it's the exact same thing - and it means my calendar isn't reliable anymore.
I've made sure the time-zone settings are correct, I've updated all software, and gone through all possible settings for both my i-phone and Outlook. Nothing fixes the problem, even our tech guy at work didn't know what to do. I know it's not just my phone as the exact same thing has happened with my boss's iPhone which is an iPhone 3G, and it frustrates him to no end.
I'm really hoping someone at apple can tell us what's going on, especially since it never used to do this and there doesn't seem to be any way to fix it. If someone thinks they know what itunes update this was due to, let me know - I'll see if I can go back to that older version.

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