§ 500. General rule.

Years of Credited Service, for purposes of calculating a Participant's retirement income according to Chapter 6 hereof, shall equal the sum of the Participant's Past Service and Future Service as defined in Sections 501 and 502 hereof, except for periods excluded according to Section 503 hereof. Credited Service shall be measured in years and completed calendar months, disregarding fractions of calendar months and counting each completed calendar month as eight hundred thirty-three ten thousandths (.0833) of a year.