The Xuanming calendar (宣明历), also known as Senmyō-reki or Senmei-reki[1] in its Japanese version, was a Chinese lunisolar calendar.
In 893, it was replaced by the Chongxuan calendar (崇玄曆), which was used to the end of the Tang dynasty and beyond.
[4] In 893, it was replaced by the Chongxuan calendar (崇玄曆), which was used to the end of the Tang dynasty and into the subsequent Five Dynasties and Ten Kingdoms period.
The earliest record of this calendar being used in Japan is in the 8th month of the 3rd year of Jōgan (861) during the reign of the Emperor Seiwa.
[6] It would continue to be used until 1685, after which it would be superseded by the Jōkyō calendar, the first calendar developed specifically for Japan; by that point the calendar was in error by about two days.