Jimmy Carter actually said...
I also designate as Constitution Week the period beginning September 17 and ending September 23, 1979, and urge all Americans to observe that week with appropriate ceremonies and activities in their schools, churches and in other suitable places in order to foster a better understanding of the Constitution, and of the rights and duties of United States citizens.
Context
Proclamation 4670—Citizenship Day and Constitution Week, 1979
07/22/1979