Feature: List Available Timezones

[impleri]

I'm filing this as a new issue since #122 is pretty old. Intl API does allow listing timezones via Intl.supportedValuesOf('timeZone'), so I could see a method grabbing that data, decorating the values, and returning an nicer list (perhaps using getTimezoneOffset and creating an object of { name, offset, offsetInHours, region } and maybe pre-sorted by offset or name.

[marnusw]

Interesting, and certainly a good idea. I'm rather busy at the moment, so a PR will get this out sooner than leaving it to me, but I do support this functionality and will leave this open to add in due course. Thanks @impleri.

[marnusw]

It seems like this is possible now using Intl.supportedValuesOf('timeZone')