I just saw this article, and learned a new trick! (see link at bottom of page for full article)
The sheet produces a timestamp for a cell, using a formula similar to the one below :--
=IF(C3="","",IF(C3="",D3,NOW()))
Where c3 is the cell to timestamp and d3 is the cell containing this formula!
for this to work Iterative calculation has to be turned on!
But it will record the last change of the cell to the left and not change on re-calculation, only on re-entery!
http://chandoo.org/wp/2009/06/25/tod...racking-tools/
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