How often do you encounter challenges related to your birthday? Meaning, not just on the day of Feb 29, but any day of the year when you're trying to select your birth date or something like that. Do you ever find forms where the date is missing or the backend wont accept it?
If it makes you feel better.... On February 29, 2008 I was working on a system as a government contractor. Part of it was outsourced to a sub-contractor who decided to write their own date/time library because how hard could that be (which I only learned about later)? For some reason NOTHING would work right that day. Took me longer than I'd care to admit of staring at the logs to realize that some started with March 1 2008....
Definitely not any more coherent on a leap year! That remark only applied to dates stored without a year, as in “February 29” rather than “February 29, 2008”.
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.