Pub. L. 93-406, tit. IV, subtit. C, sec. 4048
date of termination
date of termination Sec. 4048. For purposes of this title the date of termination is— (1) in the case of a plan terminated in accordance with the provisions of section 4041, the date established by the plan administrator and agreed to by the corporation, (2) in the case of a plan terminated in accordance with the provisions of section 4042, the date established by the corporation and agreed to by the plan administrator, or (3) in the case of a plan terminated in accordance with the provisions of either section in any case in which no agreement is reached between the plan administrator and the corporation (or the trustee), the date established by the court.