二〇二一年,繼二〇二〇年,下二〇二二年。
合黃帝紀元四七一八年,孔子二五七二年,中華民國一一〇年,日本令和三年,皇紀二六八一年,朝鮮主體一一〇年,檀君紀元四三五四年,佛曆二五六五年,回曆一四四二年,歲次辛丑,肖牛。
是年瘟疫橫行寰宇。
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