Have a cell calculate only once

[Guest]

Is there a way to have a cell calculate only once or only on a certain date?
Example A1 and A2 are numbers and C3 is a date
= A1+A2, only if C3=now

Or it could just be a formula that is contrained ot only calculate once.
Mayeb when it is created.
Thanks,
adam

 

[Guest]

You can adapt something from here

http://www.mcgimpsey.com/excel/timestamp.html



Regards,

Peo Sjoblom

 

[Guest]

This is an example of making a one time calculation:

1. enter the following into worksheet code:

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
Cells(1, 3).Value = Cells(1, 3).Value
End Sub

2. enter 12 in A1
3. enter 25 in B1
4. enter =A1+B1 in C1

The value 37 will appear in C1 without a formula