[1] GitHub API v3 ( (2014-03-06 21:24:24 +09:00 版)) http://developer.github.com/v3/#timezones

[2] Improved timezone handling in the API ( (2014-03-29 10:47:25 +09:00 版)) https://developer.github.com/changes/2014-03-04-timezone-handling-changes/