Mich. Comp. Laws § 38.75 : CIVIL SERVICE AND RETIREMENT —TEACHERS' TENURE — DEFINITIONS — School year; definition TEXT PDF The "school year" shall be defined as the legal school year at the time and place where service was rendered. MCL 38.75 1937, Ex. Sess., Act 4, Eff. 9/1/1937 ;--CL 1948, 38.75.