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Default why does excel 2007 subtract 2009 from 2015 = 1900?

have tried different formats for the dates, always comes up the same. have
formated in date/time format,
=(YEAR(10/16/2015)-YEAR(05/11/2009))*12+MONTH(10/16/2015)-MONTH(05/11/2009)=
1/0/1900.....what is wrong here?
 
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