Frequently Asked Questions

Pick a date, time, and source time zone, then add one or more target zones. Each target instantly shows the converted local time, its UTC offset, and whether the date shifts by a day.

Yes, completely free with no sign-up and no limits.

All IANA time zones supported by your browser — hundreds of zones covering every country and major city, searchable by typing.

Yes. Offsets are calculated for the specific date you choose using your browser's built-in time zone database, so a conversion in January and the same conversion in July correctly reflect whichever zones observe daylight saving at that time of year.

A +1d or -1d badge appears when the converted time falls on the next or previous calendar day in that zone — for example, 11 PM in New York is already the next morning in Tokyo. This makes it obvious when you're scheduling something that crosses midnight somewhere.

Yes, add as many target zones as you like using the quick-pick buttons or the search box, and every result updates together whenever you change the source date, time, or zone.

UTC (Coordinated Universal Time) is the time standard the world's time zones are defined relative to. It doesn't observe daylight saving time, which makes it a useful fixed reference point when coordinating across zones.

Offsets come directly from your browser's built-in time zone database (the same one used by your operating system), which is regularly updated to reflect real-world daylight saving and time zone rule changes.

No. All conversion happens locally in your browser using the Intl API. Nothing is sent to a server, stored, or logged.

Yes, the tool is fully responsive and works on any modern phone, tablet, or desktop browser.