fuzzyworld

when-am-i / files / src / data / calendars / japan.json

japan.json

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bdbeab60 2026-06-21 Pavel Safronov1{
2 "region": {
3 "name": "Japan",
4 "geo": {
2f202e69 2026-06-23 Pavel Safronov5 "type": "MultiPolygon",
bdbeab60 2026-06-21 Pavel Safronov6 "coordinates": [
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2f202e69 2026-06-23 Pavel Safronov8 [
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bdbeab60 2026-06-21 Pavel Safronov278 ]
279 ]
280 }
281 },
282 "eras": [
283 {
284 "name": "Lunisolar calendar (pre-1873)",
285 "start": null,
286 "end": "1873-01-01",
287 "calendar": "Japanese lunisolar calendar",
288 "usedBy": "the Japanese",
289 "description": "Before 1873 Japan used a Chinese-derived lunisolar calendar, with years named by regnal eras (nengō) under the reigning emperor and by the sexagenary cycle. Because months followed the moon and were periodically intercalated, there is no continuous numbered year to convert to here.",
290 "sources": [
291 "https://en.wikipedia.org/wiki/Japanese_calendar",
292 "https://en.wikipedia.org/wiki/Japanese_era_name"
293 ]
294 },
295 {
296 "name": "Imperial era (nengō)",
297 "start": "1873-01-01",
298 "end": null,
299 "calendar": "Japanese",
300 "usedBy": "the Japanese",
301 "description": "In 1873 Japan adopted the Gregorian solar calendar for day-to-day dates but kept counting years by the imperial era name (nengō) of the reigning emperor — Meiji, Taishō, Shōwa, Heisei, and since 2019 Reiwa — which remains in official and everyday use alongside the Western year. Reiwa 1 corresponds to 2019.",
302 "sources": [
303 "https://en.wikipedia.org/wiki/Japanese_era_name",
304 "https://en.wikipedia.org/wiki/Reiwa_era",
305 "https://en.wikipedia.org/wiki/Japanese_calendar"
306 ]
307 }
308 ]
2f202e69 2026-06-23 Pavel Safronov309}