You would use a worksheet change event
their are several examples of automatically inserting a date on this page:
http://www.mvps.org/dmcritchie/excel/event.htm#autodate
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HTH,
David McRitchie, Microsoft MVP - Excel [site changed Nov. 2001]
My Excel Pages: http://www.mvps.org/dmcritchie/excel/excel.htm
Search Page: http://www.mvps.org/dmcritchie/excel/search.htm

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I have an Inventory worksheet and an Order Form worksheet. I need Excel to
change Item"s date in the Inventory worksheet when that Item and the quantity
are sold and I fill out the Order Form.

I want the Item in the Inventory worksheet to reflect the date when it was
sold and I want Excel to change that date for me automatically.

What function do I use?