D.C. Code § 47-1812.08
Section 7093 of D.C. Law 18-223 provided:
"Sec. 7093. Applicability. Section 7092 shall apply as of April 24, 2010."
Section 8093 of D.C. Law 19-21 provided: "Sec. 8093. Applicability.
"This subtitle shall apply as of January 1, 2012."
Section 410(e) of D.C. Law 13-305 provided: "Section 406(b), (d), (f), (l), (n), (o), (r), (v), (x)through (aa), (cc), (ff), (gg), (ll), (pp), (vv), (ww), (aaa), (ccc), (eee), and (ggg) shall apply as of January 1, 2001."
Section 3 of D.C. Law 18-108 provided: "Section 2 shall apply for tax years beginning January 1, 2009."
Applicability of D.C. Law 20-61: Section 11001 of D.C. Law 20-61 provided that, except as otherwise provided, the act shall apply as of October 1, 2013.