How to display a date/time with its original timezone, instead of displaying localized version

This isn't a bug, but I feel I'm misunderstanding something.

Given the date `2021-10-13T16:00:00-07:00`, how can I display it as `October 13, 2021 4:00pm PDT`, i.e. honouring it's specified timezone, without having to provide a timezone name, having it converted to a local date/time, or using UTC?

No file, test, or entry point is named. Start by tracing how the example date is parsed and formatted, then check whether the existing API can preserve its supplied offset. Done means documenting the supported usage for the requested output, or identifying the missing behavior precisely.

Written by the indexing model from the issue text.