(a) Except as provided in subdivision (c), following completion of six months of continuous service, for each completed calendar month of service, except as provided in Section 19858.2, each state officer and employee who is employed full time shall receive credit for vacation with pay in accordance with the following schedule:
1 month to 3 years
56 day per month
37 months to 10 years
1¼ days per month
121 months to 15 years
1512 days per month
181 months to 24 years
1712 days per month
289 months and over
123 days per month
The computation of credit for the month of January 1964, and each month thereafter, shall be based upon the schedule set forth in this subdivision, except that the rate of vacation credit allowed shall not be reduced for any officer or employee employed prior to January 1, 1964. The time when vacation shall be taken shall be determined by the appointing power of the officer or employee.
(b) If the provisions of subdivision (a) are in conflict with the provisions of a memorandum of understanding reached pursuant to Section 3517.5, the memorandum of understanding shall be controlling without further legislative action, except that if the provisions of a memorandum of understanding require the expenditure of funds, the provisions shall not become effective unless approved by the Legislature in the annual Budget Act.
(c) Following completion of six months of continuous service, for each completed calendar month of service, except as provided in Section 19858.2, each state officer and employee who is employed full time and is either excluded from the definition of state employee in subdivision (c) of Section 3513, or is a nonelected officer or employee of the executive branch of government who is not a member of the civil service, shall receive credit for vacation in accordance with the following schedule:
1 month to 3 years
78 day per month
37 months to 10 years
138 days per month
121 months to 15 years
158 days per month
181 months to 20 years
1¾ days per month
241 months to 25 years
178 days per month
301 months and over
2 days per month
The time when vacation shall be taken shall be determined by the appointing power of the officer or employee.