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In the first two seasons of _Code Geass_ , dates are mentioned with "a.t.b.".
I took this screenshot from first episode of season one:

!["2010 a.t.b., August 10th"](https://i.stack.imgur.com/wZjkw.jpg)

However, in _Code Geass: Akito the Exiled_ , dates are mentioned as R.Y.
(Revolution Year). This is a screenshot from the _Akito the Exiled_ trailer:

!["Revolution Year 228; EU - Europe United
Alliance"](https://i.stack.imgur.com/fgvX0.jpg)

So, first question: **What does a.t.b. stand for?**  
And, also: **How can we convert between a.t.b. and R.Y.? Which Revolution Year
would 2010 a.t.b. be?**


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How can we convert between a.t.b. and Revolution Year?


> **What does a.t.b. stand for?**

It stands for "Ascension Throne Britannia", named after the "date the first
Celtic super-king, Eowyn, was elected by the united British tribes to battle
Rome, becoming the first member of the modern Britannian imperial
family."[{1}](http://codegeass.wikia.com/wiki/World_History) 55
[B.C.](http://en.wikipedia.org/wiki/Anno_Domini) is equivalent to 1 a.t.b.

* * *

> **How can we convert between a.t.b. and R.Y.?**

The Revolution Year system (used by the EU in _Code Geass_ ) is based on the
French Revolution (start date) of 1789
A.D.[{2}](http://en.wikipedia.org/wiki/French_Revolution)[{3}](http://codegeass.wikia.com/wiki/European_Union#Akito_Worldview_Columns)
Since 55 B.C. is 1 a.t.b., we can figure out the actual conversion formula:

> 0 R.Y. = 1789 A.D. = 1845 a.t.b.

If you want a simple conversion between a.t.b. and R.Y., just some simple
math:

> R.Y. = a.t.b. - 1845

* * *

> **Which Revolution Year would 2010 a.t.b. be?**

Based on the conversion above, a.t.b. 2010 is equivalent to R.Y 165.


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answer


At the beginning of the second episode of Akito the Exiled, the following is
said:

> Revolution Year 228. It has been seven years since the Empire of Britannia
> invaded Japan and renamed it Area 11.

Because the invasion of Japan happened in 2010 a.t.b, it can be deduced that
the offset, at least in the time frame of the series, between a.t.b and R.T
is:

[code]

    2010 + 7 - 228 = 1789
    
[/code]

So it appears that R.Y. 0 would correspond to 1789 a.t.b.


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