A century year, that is, a year which ends in two zeroes 1800, 1900, 2000, etc., is not a leap year unless it is also evenly divisible by 400. This means that the year 2000 was a leap year and 2400 will also be one, but 1800 and 1900 were not leap years, and the years 2100, 2200, and 2300 won't be leap years either.
Those who are born on this day usually celebrate their birthdays on February 28 during non-leap years.
This day may be colloqially termed a leap day.
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4 Holidays and observances
Holidays and observances