Section 550.302 - Effective date(a) The term effective date refers to the effective date of the applicable prohibitions and directives contained in this part, and with respect to a person whose property and interests in property are blocked pursuant to § 550.201 or on whom other sanctions are imposed, the earlier of the date of actual or constructive notice that such person's property and interests in property are blocked or that other sanctions are imposed on such person.(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 imposition of other sanctions is published in the FEDERAL REGISTER.