BUG: Fix broken YearBegin offset. Closes #2844.
BUG: Fix corner case in YearBegin
STY: Remove unnecessary old code.
TST: Use correct expectations for AS in tests
Merge remote-tracking branch 'jseabold/fix-2844'

* jseabold/fix-2844:
  TST: Use correct expectations for AS in tests
  STY: Remove unnecessary old code.
  BUG: Fix corner case in YearBegin
  BUG: Fix broken YearBegin offset. Closes #2844.