D.C. Mun. Regs. tit. 1, § 1702
1702.1 Agencies shall make payments as close as possible to, but not later than, the required payment dates specified in § 1707.
1702.2 Agencies shall mail or deliver checks to business concerns on or about the same day that the checks are dated.
1702.3 If an agency makes a payment by check, the payment shall be considered made on the date the payment check is dated.
SOURCE: Final Rulemaking published at 35 DCR 8131, 8132 (November 18, 1988).