WD2000: Macro to Determine the Number of Days Between Two Dates (211445)

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The DateValue() function converts a specified date, beginning with December 30, 1899, to a serial number.

Syntax: DateValue(DateText$)

Examples

   x = DateValue("12/30/1899")  ' returns 0 or zero
   x = DateValue("12/31/1899")  ' returns 1
   x = DateValue("12/5/1992")   ' returns 33943
				

The Sgn() function is used to determine if the difference between two dates is negative or positive number. A negative value indicates a date in the past, while a positive value indicates a date in the future.

Sub DayDiff()
   Dim sDate As String
   Dim intNumDays As Integer
   On Error GoTo errhandler
   ' Prompt for a date.
   sDate = InputBox$("Enter a date in the mm/dd/yy format")
   ' Get difference between dates.
   intNumDays = CInt(DateValue(sDate) - Now())
   ' Determine if difference is past or future.
   If Sgn(intNumDays) = 1 Then
      MsgBox "Days between " + sDate + " and today :" + CStr(intNumDays)
   Else
      MsgBox "The date " + sDate + " was" + CStr(Abs(intNumDays)) _
      + " day(s) ago."
   End If
errhandler:
   If Err > 0 Then MsgBox "Please enter a valid date."
End Sub
				

For more information about how to use the sample code in this article, click the article number below to view the article in the Microsoft Knowledge Base: