Hierarchy classification:

1. top of the aat hierarchies
2. Associated Concepts Facet
3. Associated Concepts (hierarchy name)
4. multidisciplinary concepts
5. [dates and dating systems]
6. dating systems
7. [dating systems by specific type]

Narrower term/s

• [months for Gregorian and Julian calendars] [NP][+]
  • January
  • February
  • March (month)
  • April
  • May
  • June
  • July
  • August
  • September
  • October
  • November
  • December

Anotations

Scope note:

The internationally most widely used civil calendar, named for Pope Gregory XIII, who introduced it in October 1582. It is typically used as a proleptic calendar, which means the dates are extended backward to dates preceding its official introduction in 1582. The Gregorian calendar was a refinement to the Julian calendar, correcting the length of the year by 0.002% through alteration of leap years.