To do what you want requires a Worksheet_Change event macro. The following
macro will put the date in B1 whenever A1 changes to anything =0. However,
if B1 is already occupied, nothing will change in B1 no matter what happens
in A1.
Note that this macro must be placed in the sheet module of your sheet. To
access that module, right-click on the sheet tab, select View code, paste
this macro into that module. "X" out of the module to return to your sheet.
HTH Otto
Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Count 1 Then Exit Sub
If Not Intersect(Target, Range("A1")) Is Nothing Then
If IsEmpty(Target.Offset(, 1).Value) Then _
If Target.Value = 0 Then Target.Offset(, 1).Value = Date
End If
End Sub

wrote in message
ups.com...
If a cell returns a certain value, can a date be made to appear in an
adjacent cell that will not change even if the first cell's value does
change with time. For example, if cell A1=1, then B1 shows the date
A1=1, even though A1 will eventually excede the value of 1 (therefore
A1=1). I need a date macro that will show only the first date A1=0.
Thanks.