California Code, Probate Code - PROB § 6113

(a) The will is executed in compliance with Section 6110 or 6111 or Chapter 6 (commencing with Section 6200) (California statutory will) or Chapter 11 (commencing with Section 6380) (Uniform International Wills Act).

(b) The execution of the will complies with the law at the time of execution of the place where the will is executed.

(c) The execution of the will complies with the law of the place where at the time of execution or at the time of death the testator is domiciled, has a place of abode, or is a national.