You could use a formula that changes to the current date -- no matter when
it
opens:
=today()
If you want date that doesn't change after the first time it's applied,
you
could use a macro:
Option Explicit
Sub auto_Open()
With ThisWorkbook.Worksheets("Sheet1").Range("a1")
If IsEmpty(.Value) Then
.Value = Date
End If
End With
End Sub
This looks to see if A1 on Sheet1 is empty. If it is, it plops in today's
date.