Supposing you have a list of year in the worksheet, the following long formula can help you to determine if a given year is a leap year or not. Please do as this:
1. Besides the year cells, in a blank cell, enter this formula:
=IF(OR(MOD(A2,400)=0,AND(MOD(A2,4)=0,MOD(A2,100)<>0)),"Leap Year", "NOT a Leap Year"), (A2 contains year that you want to apply this formula, you can change it to your need) see screenshot:
2. Then drag the fill handle over to the range that you want to contain this formula, and all the years have been checked if they are leap years or not.
Note: If the relative cell is blank, this formula will show Leap Year, too.
Check if a year is a leap year with User Defined Function
You can also create User Defined Function to check if the year is a leap year, you can complete it as these:
1. Hold down the ALT + F11 keys, and it opens the Microsoft Visual Basic for Applications window.
2. Click Insert > Module, and paste the following code in the Module Window.
VBA code: check if a year is a leap year
Function IsLeapYear(pYear As Integer) As Boolean
If (pYear Mod 4) = 0 And (pYear Mod 100) <> 0 Or ((pYear Mod 400) = 0) Then
IsLeapYear = True
IsLeapYear = False
3. Then save and close this code, go back to your worksheet, and enter this formula: =isleapyear(A2), see screenshot:
4. Then drag the fill handle to the cells that you want to contain this formula, and all the years have been checked off, the FALSE stands for not a leap year and the TRUE indicates a leap year. See screenshot:
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What about relying on Excel's own definition of a leap year?
The expression below checks the difference between March 1st and Feb 28 in that year - a leap year will have Feb 29 in-betweek, which makes a difference of 2 days. IsLeapYear formula: = ( DATE( $$YEAR_REF$$ ;3;1)-DATE( $$YEAR_REF$$ ;2;28) > 1.5 )
The 1.5 is because I'm not sure if there is a risk of floating-point inaccuracies...