Years before 0 or after 9999 are not defined in 8601 (there is some attempt to allow for them, but it's not really specified). Also, the lexicographic sorting w

Years before 0 or after 9999 are not defined in 8601 (there is some attempt to allow for them, but it's not really specified). Also, the lexicographic sorting would be ruined (if it isn't already by timezones).