Feb 28 is definitely too early, you haven't lived a whole year yet since your birthday. So March 1 it is. It's not your birthday but you can celebrate having made it another year.
Your calendar year birthday would be March 1 since one full calendar year has elapsed.
But Feb 28 is the nearest day to one full solar year, assuming you were born before about 6pm local time on Feb 29.
Two-day long birthday it is! :)