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Leap Year Logics In SQL Server

Manoj Sevda

Some exceptions to this rule are required since the duration of a solar year is slightly less than 365.25 days. Years that are evenly divisible by 100 are not leap years, unless they are also evenly divisible by 400, in which case they are leap years. For example, 1600 and 2000 were leap years, but 1700, 1800 and 1900 were not. Similarly, 2100, 2200, 2300, 2500, 2600, 2700, 2900 and 3000 will not be leap years, but 2400 and 2800 will be.”

If you use logic of divide by 4 and remainder is 0 to find leap year, you will may end up with inaccurate result. The correct way to identify the year is to figure out the days of February and if the count is 29, the year is for sure leap year.

DECLARE @year INT
SET @year = 2012
IF (((@year % 4 = 0) AND (@year % 100 != 0)) OR (@year % 400 = 0))
PRINT '1'
ELSE
print '0'

DECLARE @Year INT = 2012
SELECT ISDATE('2/29/' + CAST(@Year AS CHAR(4)))

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