timezone: please provide config option and API methods

[davidmcnabnz]

Prerequisites

• I have searched for duplicate or closed feature requests.
• I have read the contributing guidelines.

Proposal

This is a request to provide support for clients, in one timezone, to be able to interact with the picker widget displaying/editing times in a different timezone.

Ideally, this support would be in the form of:

• Config option for 'timezone'
• API verb setTimezone()
• API verb getTimezone()

Justification explained in next section.

Motivation and context

This use case should more than justify the effort involved.

• Online service provider serving users in a specific timezone (eg France (UTC+01:00))
• Support staff for this provider living in numerous timezones around the world
• Support staff, regardless of their own respective local times, need to review logs and billing periods based on France

The widget would continue to use Date-like objects which natively store time as seconds since epoch. But its methods would return values in respect to the chosen timezone, not the local one.

[Eonasdan]

I have plans to do this but TZ are hard to deal with but it is on the roadmap.

[nls-rbarber]

To solve this you could add a Luxon plugin to the project. Luxon is very easy to work with. But not sure how it would integrate with the library.