California Code, Education Code - EDC § 44848

When any certificated employee shall have resigned or been dismissed for cause and shall thereafter have been reemployed by the board, his date of employment shall be deemed to be the date on which he first accepted reemployment (if reemployed before July 1, 1947) or rendered paid service (if reemployed after June 30, 1947) after his reemployment.

When an employee's services are terminated for lack of enrollment or discontinuance of service or are otherwise interrupted in a manner declared by law not to constitute a break in service, his original order of employment shall stand.