It's definitely a big step up from ISO8601 (removal of useless stuff, stricter rules, no defaulting to local time), but it still lacks time zone information. S

It's definitely a big step up from ISO8601 (removal of useless stuff, stricter rules, no defaulting to local time), but it still lacks time zone information. Since internet protocols are almost always talking in terms of events when it comes to time (and almost always in the past), RFC3339 is fine for its purpose. But for other uses of time it's not enough. I did up a little summary of use cases here: https://github.com/kstenerud/compact-time/blob/master/compact-time-specification.md#how-to-keep-time https://github.com/kstenerud/compact-time/blob/master/compac...