Cal. FAM § 2102

(a) From the date of separation to the date of the distribution of the community or quasi-community asset or liability in question, each party is subject to the standards provided in Section 721, as to all activities that affect the assets and liabilities of the other party, including, but not limited to, the following activities:

(1) The accurate and complete disclosure of all assets and liabilities in which the party has or may have an interest or obligation and all current earnings, accumulations, and expenses, including an immediate, full, and accurate update or augmentation to the extent there have been material changes.

(2) The accurate and complete written disclosure of any investment opportunity, business opportunity, or other income-producing opportunity that presents itself after the date of separation, but that results from any investment, significant business activity outside the ordinary course of business, or other income-producing opportunity of either spouse from the date of marriage to the date of separation, inclusive. The written disclosure shall be made in sufficient time for the other spouse to make an informed decision as to whether the spouse desires to participate in the investment opportunity, business, or other potential income-producing opportunity, and for the court to resolve any dispute regarding the right of the other spouse to participate in the opportunity. In the event of nondisclosure of an investment opportunity, the division of any gain resulting from that opportunity is governed by the standard provided in Section 2556.

(3) The operation or management of a business or an interest in a business in which the community may have an interest.

(b) From the date that a valid, enforceable, and binding resolution of the disposition of the asset or liability in question is reached, until the asset or liability has actually been distributed, each party is subject to the standards provided in Section 721 as to all activities that affect the assets or liabilities of the other party. Once a particular asset or liability has been distributed, the duties and standards set forth in Section 721 shall end as to that asset or liability.

(c) From the date of separation to the date of a valid, enforceable, and binding resolution of all issues relating to child or spousal support and professional fees, each party is subject to the standards provided in Section 721 as to all issues relating to the support and fees, including immediate, full, and accurate disclosure of all material facts and information regarding the income or expenses of the party.