Cal. Education Code § 42238.5

(a) For purposes of Section 42238, the fiscal year average daily attendance shall be computed pursuant to paragraph (1) or (2). (1) The second principal apportionment regular average daily attendance for either the current or prior fiscal year, whichever is greater. However, prior fiscal year average daily attendance shall be adjusted for any loss or gain of average daily attendance due to a reorganization or transfer of territory. (2) Any school district that elects to receive funding pursuant to Article 4 (commencing with Section 42280) shall compute its units of average daily attendance for purposes of Section 42238 by subtracting the amount determined in subparagraph (B) from the amount determined in subparagraph (A). (A) The units of average daily attendance computed pursuant to paragraph (1). (B) The units of average daily attendance resulting from pupils attending schools funded pursuant to Article 4 (commencing with Section 42280). (b) For purposes of this article, regular average daily attendance shall be the base revenue limit average daily attendance, excluding summer school average daily attendance. (c) For purposes of this section, for the 1998–99 fiscal year only, the prior year average daily attendance shall be the 1997–98 regular average daily attendance, excluding absences excused pursuant to subdivision (b) of Section 46010, as that subdivision read on July 1, 1996. (d) Commencing with the 2013–14 fiscal year, this section shall be used only for purposes of allocating revenues received pursuant to subparagraph (B) of paragraph (3) of subdivision (e) of Section 36 of Article XIII of the California Constitution. (e) This section shall become inoperative on July 1, 2033, and, as of January 1, 2034, is repealed.