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.

More Information

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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

For more information about getting help with Visual Basic for Applications, please see the following article in the Microsoft Knowledge Base:
163435 VBA: Programming Resources for Visual Basic for Applications
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Article ID: 171044 - Last Review: Jul 13, 2009 - Revision: 1

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