37 CFR §7.26

1. (a)If a request for extension of protection of an international registration to the United States is made in an international application and the request includes a declaration of a bona fide intention to use the mark in commerce as set out in § 2.33(e) of this chapter, the filing date of the extension of protection to the United States is the international registration date.
2. (b)If a request for extension of protection of an international registration to the United States is made in a subsequent designation and the request includes a declaration of a bona fide intention to use the mark in commerce as set out in § 2.33(e), the filing date of the extension of protection to the United States is the date that the International Bureau records the subsequent designation.