California Code, Revenue and Taxation Code - RTC § 41054

(b)(1) In the case of a disaster, the department, for a period not to exceed three months, may extend the time for making any report or return or paying any surcharge required under this part. The extension may be granted at any time provided a request therefor is filed with the department within or before the period for which the extension may be granted.

(2) For purposes of this section, “disaster” means fire, flood, storm, tidal wave, earthquake, or similar public calamity, whether or not resulting from natural causes.