69.19  Terms of appointments confirmed by the senate.
  All terms of office of positions which are appointed by the governor, have a fixed term and are subject to confirmation by the senate shall begin at 12:01 a.m. on May 1 in the year of appointment and expire at 12:00 midnight on April 30 in the year of expiration.
[C81, §69.19]

Confirmation, see §2.32