Cal. Fam. Code § 2342

Where a joint petition for summary dissolution under Chapter 5 (commencing with Section 2400) is thereafter revoked and either party commences a proceeding pursuant to Section 2330 within 90 days from the date of the filing of the revocation, the date the judgment becomes a final judgment under Section 2339 shall be calculated by deducting the period of time that has elapsed from the date of filing the joint petition to the date of filing the revocation.