Time Zone Converter Free Online
Convert any date and time between 21 world time zones with automatic daylight-saving handling. Quickly plan meetings, calls, or travel across continents using the world-clock view.
World Clock
Pro — bulk batch conversion, API access, history & favorites
API access · Priority queue · Team workspace
How It Works
Pick Date & Time
Use the date-time picker in the From panel to choose any date and time. Click the "Now" button to use the current moment. The shortcut buttons (+1 hr, +3 hr, +1 day) let you nudge the time in fixed steps — useful when planning a series of meetings or scheduling work shifts.
Pick Source & Target Zones
Choose the source time zone (the zone in which the date & time is interpreted) and the destination zone. We support 21 zones covering every populated continent. The swap button reverses the direction in one click.
See the World Clock
The World Clock panel below shows the same moment in every supported time zone, side by side. This is the fastest way to find a meeting time that works for participants on three different continents — scan the list and pick a row where every time looks reasonable.
Time Zone Converter Features
Automatic DST Handling
Daylight-saving rules are applied automatically using your browser's built-in IANA time-zone database. So London is GMT in winter (UTC+0) and BST in summer (UTC+1), New York is EST in winter (UTC−5) and EDT in summer (UTC−4). You do not need to know which zones are currently on DST — just pick the city.
21 World Zones
Coverage of every populated continent: Americas (LA, Denver, Chicago, NY, São Paulo), Europe (London, Paris, Berlin, Moscow), Africa (Lagos, Johannesburg), Middle East (Dubai), Asia (Mumbai, Bangkok, Shanghai, Singapore, Tokyo, Seoul), and Oceania (Sydney, Auckland) — plus UTC as the universal reference.
Meeting Planner
The World Clock view shows the same moment in every zone simultaneously. To plan a meeting across continents, pick a candidate time in your local zone and look down the list — any zone where the meeting falls in the 9 AM–6 PM window is a good time to suggest.
Quick Time Shortcuts
The +1 hr, +3 hr, and +1 day buttons let you instantly nudge the From time forward. Useful for finding the earliest sensible time for a global call, or for scheduling follow-ups without manually reentering the date and time.
Live Updates
The result and World Clock panel update instantly when you change the date, time, or zone. Click "Now" repeatedly to see how the world's zones shift relative to each other through the day. Combined with browser bookmarks, this is a lightweight alternative to a dedicated team time-zone app.
Runs in Browser
All time-zone conversion runs in your browser using the standard Intl.DateTimeFormat API and the IANA TZ database that ships with every modern browser. Nothing is sent to a server, no tracking. The TZ database is updated by your browser automatically when DST rules change.
Free vs Pro
| Feature | Free | Pro |
|---|---|---|
| All 21 supported zones | ||
| World clock view | ||
| Automatic DST | ||
| Save favorite zones | — | |
| Calendar export (.ics) | — | |
| Recurring meeting planner | — |
Frequently Asked Questions
Time-zone conversion uses the IANA Time Zone Database that ships with every modern browser. So when you convert, say, "2026-06-15 14:00 in New York to London", the converter knows New York is on EDT (UTC−4) on that date and London is on BST (UTC+1) — and gives you the correct local time of 19:00. For winter dates (e.g. December), it correctly switches to EST and GMT. You do not need to do any DST math yourself.
We picked 21 zones that cover the major business hubs of every populated continent. Some sub-zones (Arizona does not observe DST, parts of Australia have unique offsets) would add clutter without much benefit for global meeting planning. If you specifically need a missing zone, contact us — we are open to adding more.
The "Now" button reads your computer's current local time and assigns it to the source zone you have selected. So if your computer is set to New York time and you have New York selected as the source, "Now" gives you the current real time. If you have London selected as the source instead, "Now" still uses your computer's wall-clock time — which means you are intentionally treating that wall-clock time as if it were London time. Use this carefully when planning across zones.
Use the World Clock panel: pick a candidate time in your local zone, then scan the World Clock to see what time it is for everyone else. A good rule of thumb is to find a time that falls between 8 AM and 7 PM in every participant's zone — if no such time exists, you may need to alternate (favor the inconvenient time for one team this week, another team next week).
Yes, but with limits. The IANA TZ database includes historical DST rules going back several decades for most zones. So conversions for 1990 or 2010 should be accurate. For very old dates (pre-1900) or for countries that have changed their zones (Samoa skipped a day in 2011, Russia abolished DST in 2014), edge cases may apply. For ordinary planning use, the converter is reliable.