Timezone Converter — Convert Time Between Timezones
Convert dates and times between any timezones instantly. See multiple timezones at once, detect DST, and compare time differences. 100% client-side — your data stays private.
How to Use the Timezone Converter
- Select a source timezone from the dropdown and pick a date & time.
- Click Convert — all active timezones update to show the equivalent time.
- Add timezones using the "+ Add Timezone" button or the quick-add presets below.
- Remove timezones you don't need by clicking the × button on each panel.
- Copy any time with one click using the copy button on each timezone panel.
- DST status is shown automatically when a timezone is observing Daylight Saving Time.
How It Works
The Timezone Converter uses your browser's built-in Intl.DateTimeFormat API to perform all conversions. When you select a source timezone and date/time, the tool applies the UTC offset of that timezone to compute the UTC equivalent, then applies the target timezone's offset to produce the converted time.
Timezone offsets represent the difference in hours from Coordinated Universal Time (UTC). For example, UTC-5 means five hours behind UTC. Daylight Saving Time (DST) shifts the offset forward by one hour during warmer months. The tool automatically detects DST transitions using the browser's timezone database, so you don't need to manually account for seasonal changes. DST status is displayed as a badge on each affected timezone.
Timezone Abbreviations Reference
| Abbreviation | Full Name | UTC Offset (Standard) | UTC Offset (DST) | Major Cities |
|---|---|---|---|---|
| UTC / GMT | Coordinated Universal Time | +00:00 | — | London, Reykjavik |
| EST | Eastern Standard Time | −05:00 | −04:00 (EDT) | New York, Toronto |
| CST | Central Standard Time | −06:00 | −05:00 (CDT) | Chicago, Mexico City |
| MST | Mountain Standard Time | −07:00 | −06:00 (MDT) | Denver, Phoenix |
| PST | Pacific Standard Time | −08:00 | −07:00 (PDT) | Los Angeles, Vancouver |
| GMT / BST | Greenwich Mean / British Summer | +00:00 | +01:00 (BST) | London, Dublin |
| CET / CEST | Central European Time | +01:00 | +02:00 (CEST) | Paris, Berlin, Rome |
| JST | Japan Standard Time | +09:00 | — | Tokyo, Osaka |
| IST | India Standard Time | +05:30 | — | Mumbai, Delhi |
| AEST / AEDT | Australian Eastern Standard | +10:00 | +11:00 (AEDT) | Sydney, Melbourne |
Tips for Scheduling Across Timezones
- Add all participant locations — Add every timezone of everyone involved so you can compare times at a glance.
- Check DST status — Pay attention to DST badges. Different countries change clocks on different dates, so a 5-hour difference in January might be 4 hours in March.
- Use the "Now" button — Click "Now" to start from the current time, then see what time it is everywhere else right now.
- Look for working-hour overlap — Aim for times between 8 AM and 6 PM in all participant locations when possible.
- Copy and share — Click the copy button on any timezone panel to quickly share the converted time with others.
Why Use This Timezone Converter
Scheduling across timezones is a daily challenge for remote teams, distributed companies, and anyone working with international contacts. This converter gives you an at-a-glance view of what time it is in multiple cities simultaneously — no mental math required.
It's especially useful for planning meetings, coordinating calls with colleagues abroad, checking flight times, or understanding when a deadline falls in your local time. The DST indicator prevents costly mistakes when clocks spring forward or fall back at different dates around the world.
Frequently Asked Questions
You can add up to 10 timezones at once. The default view starts with 4 common timezones, and you can add or remove as needed.
Yes. The converter uses the browser's built-in Intl API which automatically handles DST transitions. If a timezone is currently observing DST, a "DST" badge is shown on its panel.
Nothing. The tool runs entirely in your browser using JavaScript — no data is ever sent to a server. Your timezone selections and converted times stay on your device.
The tool uses the browser's Intl.DateTimeFormat().resolvedOptions().timeZone API to detect your timezone automatically. It is highlighted with a "You" badge in the timezone list.
Absolutely. The tool is fully responsive and works on phones, tablets, and desktops. The timezone panels stack vertically on smaller screens for easy reading.
Use Cases
Cross-Timezone Meeting Scheduling
Scheduling meetings across timezones is effortless when you can see equivalent times in all participants' locations.
Flight Departure Conversion
Converting flight departure times between timezones prevents confusion when traveling across different time zones.
International Team Calls
Coordinating international team calls becomes simple when everyone can see their local time side by side.
Global Business Hours Comparison
Comparing business hours globally helps determine the best overlap times for跨国 communication and collaboration.
Travel Itinerary Planning
Planning travel itineraries with accurate timezone conversions ensures you never miss a flight or appointment.