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by Patrik
Understanding Timezone Behavior in JavaScript
JavaScript Date objects are always created and manipulated relative to the user’s local timezone, which it gets from the environment.
const date = new Date("2025-05-27T20:03:00Z"); // stored as UTC
console.log(date.toString());
// → "Tue May 27 2025 22:03:00 GMT+0200 (Central European Summer Time)"To determine the client’s timezone:
Intl.DateTimeFormat().resolvedOptions().timeZone
// → "Europe/Berlin" or similarThis automatic timezone handling is key to understanding how UTC inputs appear offset when viewed or edited on the frontend.
javascript
timezone
utc
datetime
date object
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