I have made an Excel cheat sheet for important events and general YC/RL year conversion, sourcing stuff mainly from the empire timelines in the community Backstory > Races > Timeline pages but also from in-game sources and World News articles.
Looking stuff up I recently noticed that the Caldari-Gallente war outlasted the creation of CONCORD and Yoiul Conference both by over a decade - is my observation based on faulty knowledge or is this supposed to be common knowledge I have somehow missed all these years? I think this of particular importance as I always thought that CONCORD signatories were at least in nominal peace between eachother when it was formed - seeing as CONCORD ships were a result of technology sharing, best technology of all the nations and it is hard to fathom warring states sharing their technology so freely.
Timeline this observation is based on, sourced from CCP’s own sources:
AD 23154 (YC -82) Caldari-Gallente War Begins (201 years ago, also when State declares itself independent from the Federation according to State Protectorate rank flavour texts)
AD 23233 (YC -3) CONCORD is founded by the four empires and Jove
AD 23236 Yoiul Conference, “Year Zero”
AD 23248 (YC 12) Caldari-Gallente War Ends (94 years ago, incidentally also how long it lasted)
This thread is open for all other timeline related stuff you want to discuss, and one other question pops in to my mind I couldn’t find an aswer to anywhere - when was the Minmatar Republic founded? The Rebellion happened in AD 23216 and the Republic joins CONCORD apparently as an independent entity 17 years later - sometime between these events the Republic is formed, but no exact year is readily available, unless the Republic is to be considered to have formed immediately after the Rebellion, in 23216. As far as I know Republic is the only empire of which exact formation year is not known, at least to us players, but do correct me if you know better.