Japan: Polity Style: 1392-2024 |
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| 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 |
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| [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 update: 29 Nov 2023