Barack Obama actually said...
The modifications and technical rectifications to the HTS set forth in Annex III to this proclamation shall be effective with respect to goods entered, or withdrawn from warehouse for consumption, on or after the later of (i) February 1, 2017, or (ii) the thirtieth day after the date of publication of this proclamation in the Federal Register.
Context
Proclamation 9555—To Implement the Nepal Preference Program and for Other Purposes
12/14/2016