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. dates (spans of time)
7. [dates by century or millennium]

Anotations

Scope note:

CE, for "Common Era," and occasionally, "Christian Era," identifies years as part of a historical cultural current for recording dates used today. CE is used as an alternative to "AD" used by Christians, but the numbering is the same, with the same meaning as AD, and corresponds to the Gregorian Calendar. CE is now often used instead of AD particularly in scientific writing.