Don't forget that UTC has leap seconds, too. This may not cause problems for trains, but it does for servers: https://news.ycombinator.com/item?id=8839458 https

Don't forget that UTC has leap seconds, too. This may not cause problems for trains, but it does for servers: https://news.ycombinator.com/item?id=8839458 https://news.ycombinator.com/item?id=8839458 TAI is like UTC but without leap seconds.