formula in excel 2007 works not in 2013
Hi!
I am using this formula in a worksheet I created in excel 2007 but when someone open the worksheet using excel 2010 or 2013 it doesn't work it change all the numbers to #. Any ideas why?
=IF(M8="","",IF(WEEKDAY(M8)=2,"L",IF(WEEKDAY(M8)=3 ,"K",IF(WEEKDAY(M8)=4,"M",IF(WEEKDAY(M8)=5,"J",IF( WEEKDAY(M8)=6,"V",""))))))
this is for a calendar.
thanks!
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