Ability to provide IANA time zone for date formatting

🚀 feature request

Description

Ability to provide IANA time zone for date formatting.

Describe the solution you’d like

before:

const date = new Date();
const format = 'short';
const locale = 'tr';
const timezone = '+3'; // offset from GMT

formatDate(date, format, locale, timezone);

after:

const date = new Date();
const format = 'short';
const locale = 'tr';
const timezone = 'Europe/Istanbul'; // IANA time zone

formatDate(date, format, locale, timezone);

For now it’s possible to provide time zone offset from GMT (such as '+0430'), but would be great to have an option to provide IANA time zone with Intl.DateTimeFormat instance.

[petebacondarwin]

Nice! I see that it is possible (if a little ugly) in modern browsers. But unfortunately, IE11 which we still must support does not support IANA timezone names: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleString#browser_compatibility

So we would still have to polyfill that. I think someone publishing a small library would be a good way to go to provide this.

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