Tardis:Eras

Naming conventions Character names → Serials → Characters with one name → Honourifics → Magazine issues → Astronomical objects → Years → Dates → Human → Parts of a series without clear individual titles → Humanoid → Speedy renames → Lists of appearances → Universe → Integers → Assuming species → In-universe counterparts of minors → Colour spectrum policy → Eras

Shortcut:

T:BC/AD
T:ERAS

We use BC and AD, not BCE and CE. Also, we choose to believe that there is such a thing as a "year 0". This means that the 21st century began in the year 2000, not 2001 — despite the fact that this is technically not correct in the real world.

As was agreed through consensus, appendages which establish a year's position relative to year 0 shall be given in terms of "AD" and "BC". This is the overwhelmingly dominant usage within the DWU. BCE and CE may be more "politically correct" because they have no religious overtones, but such designations are very rarely used within the DWU. The Doctor himself has been heard on several occasions to use "BC" and "AD" within televised episodes, making their validity in the DWU hard to refute.

In a separate discussion, it was demonstrated that DWU sources were divided between those that believed in a year 0 and those that didn't. With a year 0, the year 2000 is the start of the second millennium and the 21st century. If there is no year 0, as is generally accepted in the real world scientific community, then 2001 is the the "anniversary date".

Because of the split in DWU fiction, however, we had to choose one or the other. In the end, it was decided to officially "believe in" a year 0, since this made programming of certain templates, like {{timeline}}, much easier.

Correct	Incorrect
The 19th century was comprised of the years 1800 to 1899. Better still, avoid defining the year span at all. {{timeline}} will show all the years for which we have pages	The 19th century was comprised of the years 1801 to 1900.