In leap years, the result is 366 and the formula returns TRUE. The leap year occurs every 4 years, but there are scenarios where the gap between two leap years was 8 years instead of the regular 4 years. In non-leap years, the result is 365 and the formula returns FALSE. Then the first of the current year is subtracted from the first of the next year. According to the Gregorian calendar, which is the civil calendar in use today, years evenly divisible by 4 are leap years, with the exception of centurial. This formula generates two dates based on the date provided: (1) the first of the next year, and (2) the first of the current year. Does that sound too complicated Well, since the next exception is. If the formula above seems too clever, and you want a more literal solution, the formula below will test if a year contains 366 days instead: =DATE(YEAR(date)+1,1,1)-DATE(YEAR(date),1,1)=366 However, when a century year is divisible by 400 (e.g. In this version, we don't extract a year value from a date, we pass a year value (i.e. However, in order to be compatible with other programs, Microsoft Excel treats the year 1900 as a leap year. To check a year only, instead of a full date, instead of a date, modify the formula as below: =MONTH(DATE(year,2,29))=2 Because versions of Microsoft Excel earlier than Excel 97 handle only years from 1900 to 2078, only the year 1900 is subject to the 100/400 exclusion rule of leap years in Microsoft Excel. If not, the month must be 3 and the formula returns FALSE. If the month is 2, the formula returns TRUE. In non-leap years however, DATE will return the date March 1 of the year, because there is no 29th day in February, and DATE simply rolls the date forward to the next month.įinally, the MONTH function simply extracts the month from the result provided by DATE, which is compared to 2 using the equal sign. In leap years, February has 29 days, so the DATE function will simply return the date February 29 of the year. In the formula, year is passed into date unchanged, along with 2 for month (February) and 29 for the day. So 1900 is not, 2000 is, 2100, 2200, 2300 is not, but 2400 is another leap year.The core of this formula is the DATE function, which will automatically adjust to month and year values that are out of range. This means that centuries are only a leap year if they are divisible by 400. Note: The above rule does not apply to century years.Ĭenturies such as 19 only have a leap day if they are divisible by 400.ġ900 is divisible by 4 and also by 100, but not by 400, so not a leap year. In an ordinary year, if you were to count all the days in a calendar from January to December, youd count it as 365 days. By adding once in the 4 years one extra additional day this problem is solved.Īny year that is divisible by 4 is a leap year, such as 2016, 2020, 2024, 2028. Some cultures consider a leap year unlucky for people. They generally will celebrate their birth on February 28 or March 1. This is done because one year doesn't contain 365 days but 365.25 days. Children born on Leap Day have a true birthday every four years. When it's a leap year?A leap year is a year with 366 days instead of 365 every 4 years in February one extra day is added.
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