In A1, enter 01/12/2005
In B1, enter date(year(A1),month(A1)+1,1) and copy across

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HTH

RP
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"heater" wrote in message
...
I want to add a month in the next cell over for several years. EX: In
cell
A1 is Dec 2005. In cell B1 I want Jan 2006 and so on for several
months/years. When you put in a formula of =A1+31, eventually it will put
in
the wrong month. I assume because of Leap Year.