Cal. Education Code § 46205

(a) For purposes of this article, instructional time for school districts conducting early-late instructional programs in kindergarten and grades 1 to 8, inclusive, shall be computed by adding the total amount of instructional time provided in each portion of the early-late instructional programs to the amount of instructional time offered when all pupils in the class are scheduled to attend. It is not the intent of the Legislature to disrupt or restrict early-late instructional programs for pupils in kindergarten and grades 1 to 8, inclusive. (b) This section shall be applicable only if the early-late instructional program was in operation during the 1983–84 fiscal year, except that the Superintendent of Public Instruction may approve, based on educational reasons, the application of this section to programs commencing operation after the 1983–84 fiscal year. (c) Notwithstanding any other provision of law, this section is not applicable to any class in any grade level for which class size reduction funding is received pursuant to the Class Size Reduction Program contained in Chapter 6.10 (commencing with Section 52120) of Part 28; provided, however, that this section may be applicable to any class in any grade level for which class size reduction funding is received pursuant to subparagraph (A) of paragraph (2) of subdivision (b) of Section 52122 if a school district operated under this section prior to July 1, 1996.