How Can I Accurately Determine a Client's Time Zone Using JavaScript?

How to Accurately Determine Client's Time Zone in JavaScript

Retrieving the time zone and offset information of a client in JavaScript is often a necessity for applications that require accurate time handling. Obtaining both the specific time zone (e.g., Europe/London) and the offset from UTC (e.g., UTC 01) is crucial.

Unfortunately, calculating the time zone based on offset alone is a flawed approach. Time zones undergo frequent adjustments throughout the year, and daylight saving rules vary, making it challenging to maintain an accurate representation.

To determine the client's IANA (Internet Assigned Numbers Authority) time zone in JavaScript, it is recommended to leverage the following method:

console.log(Intl.DateTimeFormat().resolvedOptions().timeZone);

This approach provides the most reliable and up-to-date representation of the client's current time zone based on the browser's internal settings.

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