#date  the particular "day/month/year" (usually according to the Gregorian calendar) that an event occurred; "he tried to memorizes all the dates for his history class"
  supertype:  #calendar_year__calendaryear__civil_year__civilyear  the year (reckoned from January 1 to December 31) according to Gregorian calendar
  subtype:  #BC__B.C.__before_Christ  date used in reckoning dates before the supposed year Christ was born; "in 200 BC"
  subtype:  #AD__A.D.__anno_Domini  in the year of Our Lord; date used in reckoning dates after the supposed year Christ was born, "in AD 200"
  subtype:  #date_of_reference__epoch  (astronomy) the precise date that is the point of reference for which information (as coordinates of a celestial body) is referred

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