Compare times across up to 8 timezones with DST handling. Free, private, runs in your browser.
100% private — your files never leave your browser. All processing happens locally on your device.
UTC
UTC+00:00 · same hour
America/New_York
UTC+00:00 · same hour
Europe/London
UTC+00:00 · same hour
Asia/Tokyo
UTC+00:00 · same hour
Most online timezone tools show you two cities — here to there. This one handles up to 8 zones in a single comparison, so you can coordinate a meeting across a globally-distributed team without opening eight tabs. Set a base zone and time, and every other zone shows the matching local clock, UTC offset, and day-shift (next day / previous day / same day).
Daylight saving time shifts mess up naïve timezone conversion. North America and Europe don't switch on the same dates; some regions don't observe DST at all; Australia's southern states switch in the opposite direction from the northern hemisphere. This tool uses the browser's IANA timezone database via Intl, which encodes every zone's DST rules with the correct historical and future dates. A meeting you schedule through the tool lands on the correct clock time in every participant's zone whether it's inside or outside DST.
People confuse 'EST' (Eastern Standard Time) with 'EDT' (Eastern Daylight Time) and different regions both claim 'CST' for different zones (Central Standard Time in North America, China Standard Time in Asia). IANA names like America/New_York, Europe/London, Asia/Tokyo are unambiguous — they refer to a city, not an offset, and the city's zone always has the right DST rules applied. Search the zone picker by city (e.g. 'paris' for Europe/Paris) or by region (e.g. 'asia' for a filtered list of Asian zones).
As you change the base zone, the base time, or the list of compared zones, the URL updates to encode the state. Share the URL with a colleague and they see exactly the same grid. No accounts, no sessions, no database — the entire comparison lives in the link itself.
No meeting details, no account, no data collection. All zone math runs in your browser via the Intl API — the browser already ships the full IANA zone database, so there's nothing to fetch. Ideal for coordinating sensitive meetings without letting a third-party scheduler see who you're meeting with.
Yes, automatically. The tool uses the browser's built-in IANA timezone database via the Intl API, which knows when DST starts and ends for every zone. If you set the base time on a date that falls inside DST for some zones but not others (like November for US vs. European zones), the conversion reflects that.
Every IANA timezone the browser supports — typically around 600 zones. Type in the zone picker to filter by city (e.g. 'paris' finds Europe/Paris). Common cities are easier to remember than raw UTC offsets, and the IANA name handles DST and historical changes correctly.
The URL updates as you change zones and the base time, so sharing the page URL gives the other person the exact same view. No accounts or backend storage — the state lives in the link itself.