Make as.duration (and others) Accept All ISO8601 Formats

[billdenney]

I'd like to be able to use as.duration for durations as specified in ISO8601 like

as.duration("P1Y2M10DT2H30M")

Similarly, it would be nice to be able to define intervals as with all the methods in https://en.wikipedia.org/wiki/ISO_8601#Time_intervals

[vspinu]

Period, duration and interval ISO parsing is now in master. See docs and example for period, duration, and interval.

[billdenney]

Thank you! Is it too late to ask for as.ISO8601 methods or an extension to as.character formatting? (I could help with a PR with guidance on your implementation preferences.)

[vspinu]

It's a good idea. Could you open a new issue for this? PRs are always welcome ;)