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

• Microsoft Word 97 for Windows

SUMMARY

To determine the number of days between two dates, using Visual Basic for Applications you can convert dates to serial numbers and subtract one number from the other.

MORE INFORMATION

Microsoft provides programming examples for illustration only, without warranty either expressed or implied, including, but not limited to, the implied warranties of merchantability and/or fitness for a particular purpose. This article assumes that you are familiar with the programming language being demonstrated and the tools used to create and debug procedures. Microsoft support engineers can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific needs. If you have limited programming experience, you may want to contact the Microsoft fee-based consulting line at (800) 936-5200. For more information about the support options available from Microsoft, please see the following page on the World Wide Web:

     
   http://www.microsoft.com/support/supportnet/refguide/default.asp

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

   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

   ARTICLE-ID: Q173707
   TITLE     : OFF97: How to Run Sample Code from Knowledge Base Articles

REFERENCES

For more information about getting help with Visual Basic for Applications, please see the following article in the Microsoft Knowledge Base:

   ARTICLE-ID: Q163435
   TITLE     : VBA: Programming Resources for Visual Basic for 
               Applications