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Sloth Sloth is offline
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Default Date stamp when a value is entered in a cell

You will first need to goto Tools-Options-Calculations Tab, and check the
"iteration" checkbox (this tells Excell to allow circular references). Then
input the following formula.

=IF(Joe!H4=1,IF(A1="",NOW(),A1),"")

Replace A1 with the cell the formula is in so that it refers to itself.