section_path: History/Gregorian Calendar (seireki)
section_name: Gregorian Calendar (seireki)
paragraph_text: Gregorian Calendar (seireki)
  
  The Western Common Era (Anno Domini) (西暦, seireki) system, based on the solar Gregorian calendar, was first introduced in 1873 as part of the Japan's Meiji period modernization.
  
  Nowadays, Japanese people know it as well as the regnal eras.