am 4e9a9d8e: am c89b13b9: Use Calendar.add() instead of Calendar.roll()

Merge commit '4e9a9d8ea8a31578b936b17f66177f4c1b18cddb'

* commit '4e9a9d8ea8a31578b936b17f66177f4c1b18cddb':
  Use Calendar.add() instead of Calendar.roll()