Maybe you've never thought about this because it only effects 0.07% of people, but next year is a Leap Year and this ear is not. So if you were born on February 29th, when do you celebrate? Today, February 28th, or tomorrow, March 1st?
Someone asked Leap Day babies on Reddit to chime in, and there was really no right answer.
Some die hard Leap Day babies said they only celebrate once every 4 years!
I guess Facebook even hasn't figured this out since on the 28th, they used to tell friends your birthday was "tomorrow," but then didn't send out any alert on March 1st. In the last few years, it sounds like they've switched and now just pretend the 28th is the 29th. But we've also seen people claim it defaults to March 1st for them.
If you're a Leap Baby turning 21 tomorrow is the day that matters. When a Leap Day baby turns 21, they can't technically get into a bar until 12:00 A.M. on March 1st.