J.E. McGimpsey shows a way to put a time stamp on the same row when something
changes:

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

Ken McGonagle wrote:

I have a Spreadsheet that I use to track incoming orders from customers.
Column A is used for the date I receive the order. Is there a way to say if
anything is typed in column B to automatically enter that days date and
current time into whatever the corresponding cell is in column A?

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Dave Peterson