These are diversity actions in which we are required to apply the law of California. 1 All of them are actions for wrongful death of foreign nationals occurring abroad or elsewhere in the United States. The sole question presented is whether the district court was correct in applying the California Statute of Limitations.

In considering such a question, we apply two principles. The first is that the duty of the federal court is to ascertain and apply the existing California law, 2 not to predict that California may change its law and then to apply the federal court’s notion of what that change might or ought to be. 3 ****The proper fora in which to seek to change California law are the California legislature and the California courts, not the federal courts. Only when the question has not been decided in California do we *347 have the doubtful privilege of “first guessing” what the California courts might do. This is not such a case. The second is that in doubtful cases, we defer to the judgment of the local judge, who knows at least as much about the law of his state as we do. 4

In these cases, District Judge Zirpoli, in a careful opinion, held that the California statute is applicable under California conflict of laws rules. 5 Klingebiel v. Lockheed Aircraft Corp., D.C.N.D.Cal., 1974, 372 F.Supp. 1086 .

We think that Judge Zirpoli is right 6 and affirm for the reasons stated in his opinion.

Each of the judgments appealed from is affirmed.

. Erie R. Co. v. Tompkins, 1938, 304 U.S. 64, 78 , 58 S.Ct. 817 , 82 L.Ed. 1188 .

. Decisions of the California Courts of Appeal are to be followed by a federal court where the Supreme Court of California has not spoken on the question, “in the absence of convincing evidence that the highest court of the state would decide differently.” Stoner v. New York Life Ins. Co., 1940, 311 U.S. 464, 467 , 61 S.Ct. 336, 338 , 85 L.Ed. 284 , and eases cited.

. “. . . [T]he proper function of the . . . federal court is to ascertain what the state law is, not what it ought to be.” Klaxon Co. v. Stentor Electric Mfg. Co., 1941, 313 U.S. 487, 497 , 61 S.Ct. 1020, 1022 , 85 L.Ed. 1477 .

. See, e. g., Turnbull v. Bonkowski, 9 Cir., 1969, 419 F.2d 104, 106 , and cases cited; Hall v. United States, 9 Cir., 1969, 407 F.2d 849, 850 , and cases cited; Ford v. International Harvester Co., 9 Cir., 1968, 399 F.2d 749, 752 .

. Under Erie R. Co. v. Tompkins, supra, California conflict of law rules are to be applied. Klaxon Co. v. Stentor Electric Mfg. Co., supra, 313 U.S. at 496 , 61 S.Ct. 1020 .

. Judge Zirpoli stated that Horton v. Jessie, 9 Cir., 1970, 423 F.2d 722 , “adopts a ‘significant contacts’ approach” in applying the California statute of limitations. Horton was not an attempt at an “authoritative revision of California law.” In Horton we did not reach the issue of whether or not the substance-procedure dichtomy was still viable in California. There was no need to do so because it was clear that regardless of the approach taken the California statute of limitations applied.