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

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### 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.

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The following Visual Basic for Applications sample macro prompts for a date in the mm/dd/yy format, and returns the number of days between the current date and the specified date.

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:
173707 OFF97: How to Run Sample Code from Knowledge Base Articles

### References

163435 VBA: Programming Resources for Visual Basic for Applications
Properties

Article ID: 171044 - Last Review: Jul 13, 2009 - Revision: 1