Time Zone Converter
Pick a reference time and a set of cities to compare. Each city shows its local time, date and UTC offset, so it’s easy to find a time that works for everyone.
How it works
All the conversion is done by your browser’s built-inIntl.DateTimeFormat, which knows every IANA time zone (including historical and current daylight-saving rules). There’s no server and no time-zone database to download.
The 24-hour strip shows the reference day with the current hour highlighted; each city’s row shows its local time and its offset from UTC.
Frequently asked questions
Why do some cities show the same time?
Cities in the same UTC offset (and with the same daylight-saving rules) share a local time. For example, London and Lisbon are both UTC+0 in winter.
Does it handle daylight saving time?
Yes. The browser applies each zone’s DST rules for the date you pick, so the offset shown is correct for that specific day.
Can I use any time zone name?
Yes — any IANA identifier like America/New_York orAsia/Kolkata works. The suggestions list covers the most common ones.