Jason

This is very useful! Modeling a single point is time great, modeling a time range/interval is _almost_ as common a use-case. Very handy for the [overlap](https://www.joda.org/joda-time/apidocs/org/joda/time/Interval.html#overlap-org.joda.time.ReadableInterval-)/[intersection](https://moment.github.io/luxon/docs/class/src/interval.js~Interval.html#instance-method-intersection) method in particular. Makes...

@pdavidc Thank you for doing this much needed work! WorldWind has been a key enabling library for years now :)