California Code, Family Code - FAM § 4326

(a) Except as provided in subdivision (d), in a proceeding in which a spousal support order exists or in which the court has retained jurisdiction over a spousal support order, if a companion child support order is in effect, the termination of child support pursuant to subdivision (a) of Section 3901 constitutes a change of circumstances that may be the basis for a request by either party for modification of spousal support.

(b) A motion to modify spousal support based on the change of circumstances described in subdivision (a) shall be filed by either party no later than six months from the date the child support order terminates.

(c) If a motion to modify a spousal support order pursuant to subdivision (a) is filed, either party may request the appointment of a vocational training counselor pursuant to Section 4331.

(d) Notwithstanding subdivision (a), termination of the child support order does not constitute a change of circumstances under subdivision (a) in any of the following circumstances:

(e) Notwithstanding subdivision (b), a party whose six-month deadline to file expired between January 1, 2014, and September 30, 2014, may file a motion pursuant to this section until December 31, 2014.