How this works

This uses your browser's built-in time zone database — the same data your operating system uses — so conversions automatically account for daylight saving time, historical time zone changes, and the specific rules each region follows, rather than a fixed offset that would be wrong for part of the year.

Frequently asked

Does this handle daylight saving time correctly?

Yes — because it uses the same underlying time zone data as your device, the conversion reflects whichever offset actually applies on the date you choose, not just a flat hour difference.

Why do some cities share the same time zone option?

Time zones are defined by region, not by individual city, so nearby cities that observe identical rules share the same entry in the list.