31 CFR §548.305

1. (a)The term effective date refers to the effective date of the applicable prohibitions and directives contained in this part as follows:
   1. (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. (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. (3)With respect to transactions prohibited by § 548.202, the earlier of the date of actual or constructive notice of such prohibition.
2. (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.