[1] [CITE@en[Rata Die - Wikipedia, the free encyclopedia]]
( ([TIME[2014-01-07 02:53:01 +09:00]] 版))
<https://en.wikipedia.org/wiki/Rata_Die>

[2] [[Perl]] の [CODE(perl)@en[DateTime][DateTime.pm]] が採用しています。

[3] [CITE[Date - date 3.1.2]]
([TIME[2019-03-28 20:38:49 +09:00]])
<https://package.elm-lang.org/packages/justinmimbs/date/latest/Date#fromRataDie>