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Temporal specifies using IANA Timezone Database for all time zone aware implementations and recommends them to "include updates to the IANA Time Zone Database as soon as possible." Moreover:

> If implementations revise time zone information during the lifetime of an agent, then which identifiers are supported, the primary time zone identifier associated with any identifier, and the UTC offsets and transitions associated with any Zone, must be consistent with results previously observed by that agent.

Basically, the timezone data must not change while a browser tab, a Node program, or a service worker is running.

AFAIK, this does not prevent possible timezone data mismatch between different versions of browser and server, or even different browsers on the same machine.

https://tc39.es/proposal-temporal/#sec-use-of-iana-time-zone...




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