From the “World days” package Leap Day 29 February, the extra day added to the Gregorian calendar once every four years Historical confidence: Attested In nearby years 1406 Tuesday 10 Esfand 1406 29 February 2028 Other occasions in this package New Year's DayValentine's DayInternational Women's DayPi DayEarth HourApril Fools' DayWorld Health DayEarth Day