Gov. Code, § 31676.96

In every county coming under the provisions of Section 31676.1, every current service pension and prior service pension payable for the time commencing on the first day of the month after the effective date of this section to any member who was retired prior to such effective date is hereby increased to the amount it would be if the provisions of this chapter, including Section 31676.1, as they exist on the effective date of this section had been in effect on the date of the actual retirement of the member, but this section does not authorize any decrease in any such pension, nor does this section give any such retired member, or his successors in interest, any claim against the county or district for any increase in any pension paid or payable for time prior to its effective date. Calculations of pensions under this section shall be made on the basis of current interest rate and mortality tables.

This section shall not apply to any retirement system established under the provisions of this chapter, nor to the members or retired members of any such system unless and until the governing board of the county or district covered by such retirement system elects to be subject to the provisions of this section in the manner provided by Article 2 (commencing with Section 31500) of this chapter with respect to the establishment of a retirement system hereunder, except that an election among the employees is not required.