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Tip of the Day
Language: Visual Basic
Expertise: Intermediate
Aug 6, 1997



Application Security Testing: An Integral Part of DevOps

Test for Leap Year

The tip "Leap Year Rules" ["101 Hot Tech Tips for VB Developers," Supplement to the August 1996 issue of VBPJ, page 22] illustrated how to easily determine if any given year is a leap year. I believe I can offer a simpler, smaller function that does the same thing. Simply pass in the year you are testing, append that year to 02/29/, and use the IsDate function to see if that is a valid date. If 02/29/xx is not a valid date, then you know it is not a leap year:
Function IsLeap(sYear As String) As Integer
	If IsDate("02/29/" & sYear) Then
		IsLeap = True
		IsLeap = False
	End If
End Function
Michael Willeson
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