17. If a teacher simultaneously holds more than one pensionable employment, the service he accomplishes is credited up to one year of service.
However, no teacher may, in the year of his retirement or in the year in which he becomes entitled to a deferred pension, be credited with more service than the number of contributory days comprised between 1 January and the date he ceased to participate in the plan.
1965 (1st sess.), c. 68, s. 7; 1973, c. 12, s. 194; 1977, c. 23, s. 14; 1982, c. 51, s. 61; 1983, c. 24, s. 2; 1987, c. 47, s. 94; 1988, c. 82, s. 67.