+--------+------------+------------+
  | name   | begin      | end        |
  +--------+------------+------------+
  | Jan    | 2003-01-01 | 2003-01-31 |
  +--------+------------+------------+
  | ...                              |
  +--------+------------+------------+
  | Dec    | 2003-12-01 | 2003-12-30 |
  +--------+------------+------------+