As shown in the screenshot below, I want to combine Month(E) and Day(E) to create a new Column with Date Type, but I don't know how. Right now Month and Day column is string type.
Ex) 2013-01-05, 2013-01-07 ...
It looks like I have to use Formula Tool.

I've spent an hour and haven't found the answer.
Any help would be greatly appreciated. Thanks