Please explain why six months added to 1/29/2005 is 6/1/2005

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Bernard V Liengme
www.stfx.ca/people/bliengme
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"Jason" wrote in message
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I have a spreadsheet where I need Excel to calculate (ADD) 6 mouths
automatable for anther date. The mouths need to be consecutive. IE in one
cell I will put 1/29/2005 and in anther cell I need Excel to put 6/1/2005