(a) Notwithstanding any other provision of this chapter to the contrary, a clerk may not receive credit for retirement purposes for any service performed as a clerk prior to six months from the time application is made for membership in the fund.

(b) Notwithstanding any other provision of this chapter to the contrary, a clerk may not receive credit for retirement purposes for deputy clerk service or for military service unless such credits are sought at the time of application for membership in the fund.