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Tip of the Day
Language: Visual Basic
Expertise: Beginner
Aug 8, 1997

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Leap Year Rules

One of the trickier parts of handling date values is dealing with leap years. Everyone knows that every fourth year is a leap year in which February has 29 days instead of the typical 28. What is less known is that there are two more rules to check to determine whether a given year is a leap year or not:

  • Years that are evenly divisible by 100 are not leap years;
  • Years that are evenly divisible by 400 are leap years.

With that in mind, I wrote this function to test whether any

given year is a leap year:

 
Function IsLeap (iYear As Integer) _
        As Integer

        'Set Default Value
        IsLeap = False

        'Check the 400 Year rule
        If (iYear Mod 400 = 0) Then
                IsLeap = True
                GoTo IsLeap_Exit
        End If

        'Check the 100 Year rule
        If (iYear Mod 100 = 0) Then
        IsLeap = False
        GoTo IsLeap_Exit
        End If

        'Check the 4 Year rule
        If (iYear Mod 4 = 0) Then
        IsLeap = True
        Else
        IsLeap = False
        End If

IsLeap_Exit:

End Function




(Note: This is the VB3 version. For VB4 substitute a Boolean return value for the function.)

Joseph H.
 
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