Mich. Comp. Laws § Article XI § 2: Terms of office of state and county officers.

Sec. 2.

The terms of office of elective state officers, members of the legislature and justices and judges of courts of record shall begin at twelve o'clock noon on the first day of January next succeeding their election, except as otherwise provided in this constitution. The terms of office of county officers shall begin on the first day of January next succeeding their election, except as otherwise provided by law.