If you are born on Feb.29 (a.k.a. St. Tib's Day), then officially the rule is your birthday is on Mar.1 if it is not a leap year. However, there is another solution which does not involve the calendar: Regardless of your date of birth, celebrate when the ecliptic longitude of the sun equals what it was at the time of your birth. --24.207.49.17 13:54, 26 September 2012 (MST)