Some challenges refer to the year a language was released. If a release is dated on 31 December or 1 January, it may depend on locale.
Should Github date be used as the official date (whatever locale the Github server is using)?
And if Github was not used to release the language, should it be the date where the company/organization was based at the time of release?
Or maybe the Zulu-time at the moment of release?
Maybe we should go by whatever date was written (or meta-data) in the release document itself?