iCal & 4S Not Syncing Correctly

Sep 18, 2011
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For some reason, my iPhone 4S and iCal does not sync all birthdays correctly. Some are right but some show birthday's 1 day early. My 3GS syncs all correctly, this just happens with my 4S. Any ideas? My iCal is correct on all birthday's but when I sync my 4S, some are off by 1 day. Anybody else run into this? Also Siri responds to some birthday's, not all as 1 day LATE. Again, this doesn't happen on all birthday's, just a few. A bug, maybe?
Any help anyone can give is appreciated.

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