Provided we follow this theory, the time before A.D. 710 (the year of the national capital transfer to Heijo-kyo) is called the Nara period's earlier half (or the Hakuho period), and the time after then is called the Nara period's latter half (or the Tenpyo period).
この場合、平城遷都の710年を境として、それ以前を奈良時代前期（または白鳳時代）、以後を奈良時代後期（または天平時代）と称する。