According to the government, Mar 1. Anything that is based on your birthday (driver's license, drinking, signing contracts, etc) all happen on March 1 if there

According to the government, Mar 1. Anything that is based on your birthday (driver's license, drinking, signing contracts, etc) all happen on March 1 if there is no Feb 29 that year. Which makes sense since then it is "after" your birthday.