Japan: Polity Style: 1392-2016

before 1392 - 29 Nov 1890 Nippon Koku [1]
29 Nov 1890 effective date of the Constitution promulgated 11 Feb 1889
29 Nov 1890 - 3 May 1947 Dai Nippon Teikoku
3 May 1947 effective date of the amendments to the Constitution promulgated 3 Nov 1946
3 May 1947 - Nippon Koku

[1] Nippon Koku is the Sino-Japanese reading (on-yomi); native Japanese reading (kun-yomi) of the same kanji is understood to be Yamato-no-kuni.
Last updated on: 19 Mar 2011 01:39:35