Currently Being ModeratedMar 1, 2011 10:27 AM (in response to APKH)I am having the same problem and would very interested in the resolution.MacBook Pro, Mac OS X (10.5.8)
Currently Being ModeratedJul 7, 2011 7:43 AM (in response to APKH)
I don't know why this happens but it happened to me also... only on the birthdays that didn't have a year in them and it defaulted to the year 0001. I changed the year to 2010 and the birthdays instantly showed on the correct day.
Currently Being ModeratedMar 29, 2013 5:50 PM (in response to APKH)
I have a similar problem, but only with some of the birthdays. For some reason two appear one day and one year earlier than I have entered them in address book. I would like to know how to sort out the reason for this and correct the errors.