# 546.303 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 § 546.201(a)(1), 12:01 a.m. eastern daylight time, April 27, 2006;(2) With respect to a person whose property and interests in property are otherwise blocked pursuant to § 546.201, the earlier of the date of actual or constructive notice that such person's property and interests in property are blocked.(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*.[89 FR 15748, Mar. 5, 2024]