D.C. Mun. Regs. tit. 27, § 3606
3606.1 For a solicitation amendment, change order, or administrative change, the effective date shall be the date on which the contracting officer issues the amendment, change order, or administrative change.
3606.2 For a bilateral modification (supplemental agreement), the effective date shall be the date agreed upon by the contracting officer and the contractor.
3606.3 For a modification converting a termination for default to a termination for the convenience of the District, the effective date shall be the same as the effective date of the termination for default.
3606.4 For a modification issued as a confirming notice of termination for the convenience of the District, the effective date of the confirming notice shall be the same as the effective date of the initial notice.
SOURCE: Final Rulemaking published at 35 DCR 1688 (February 26, 1988); as amended by Final Rulemaking published at 59 DCR 14956 (December 21, 2012).