WD97: How to Determine the Number of Days Between Two Dates (171044)

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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 a negative(date in the past) or positive(date in the future) number.

   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 additional information, please see the following article in the Microsoft Knowledge Base: