pydata/pandas — pull request #2883 by jseabold (2013-02-16 20:24:03+00:00)
Title: BUG: Fix broken YearBegin offset. Closes #2844.

This should close #2844. Good but unsettling news is it wasn't an implementation bug. The logic for handling months in the YearBegin offset just wasn't written. It was hard-coded to always be Year, 1, 1.