31 CFR 548.305: Effective date.

(a) The term effective date refers to the effective date of the applicable prohibitions and directives contained in this part as follows:

(1) With respect to a person whose property and interests in property are blocked pursuant to § 548.201(a)(1), 12:01 a.m. eastern daylight time, June 19, 2006;

(2) With respect to a person whose property and interests in property are otherwise blocked pursuant to § 548.201, the earlier of the date of actual or constructive notice that such person's property and interests in property are blocked; and

(3) With respect to transactions prohibited by § 548.202, the earlier of the date of actual or constructive notice of such prohibition.

(b) For the purposes of this section, constructive notice is the date that a notice of the blocking of the relevant person's property and interests in property, or notice of a prohibition pursuant to § 548.202, is published in the Federal Register.