Add API to construct "synthetic" Temporal.TimeZone objects?

[ptomato]

@gibson042>

time zone objects consist fundamentally of a collection of rules describing when and how local time transitions between (UTC) offsets. Although a time zone can be looked up from a common database by name, it's not a name—it's a data structure, and constructing a time zone from scratch is an important use case (cf. getTimeZoneObjectFromRules, among others).

We don't currently have anything like this in the spec or the polyfill. What should this API look like?

[littledan]

To construct a timezone from scratch, #300 lets any object which implements a few methods be used wherever a timezone could be used.

[ljharb]

Presumably there’s a constructor one can extend as well?

[littledan]

@ljharb Yes, see #300 for proposed details.

[ptomato]

OK, closing this in favour of #300.