Section 551.305 - 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 listed in the Annex to E.O. 13536, as amended by E.O. 13620, 12:01 a.m. eastern daylight time, April 13, 2010;(2) With respect to a person whose property and interests in property are otherwise blocked pursuant to § 551.201 , 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 the prohibition set forth in § 551.207 , 2:00 p.m. eastern daylight time, July 20, 2012.(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 is published in the FEDERAL REGISTER.