Colorado Code
Part 4 - Miscellaneous Provisions
§ 14-13-403. Transitional Provision

A motion or other request for relief made in a child-custody proceeding or to enforce a child-custody determination that was commenced before July 1, 2000, is governed by the law in effect at the time the motion or other request was made.
Source: L. 2000: Entire article R&RE, p. 1537, § 1, effective July 1.
A child custody proceeding will last throughout the minority of the child. The commencement of a child custody proceeding prior to this Act does not mean that jurisdiction will continued to be governed by prior law. The provisions of this act apply if a motion to modify an existing determination is filed after the enactment of this Act. A motion that is filed prior to enactment may be completed under the rules in effect at the time the motion is filed.