Free Online Timezone Converter
Scheduling a call with someone in Tokyo while you are in New York? Coordinating a product launch across London, Dubai, and Sydney? Figuring out what time a live stream starts in your local time? Our timezone converter takes the guesswork out of cross-timezone scheduling. Select a source timezone and a time, then add as many target timezones as you need — the tool converts everything instantly, accounting for daylight saving time transitions automatically.
Unlike simple UTC offset calculators, this converter uses the IANA timezone database built into your browser, which means it correctly handles DST transitions, half-hour and quarter-hour offsets (like India's UTC+5:30 or Nepal's UTC+5:45), and historical timezone rule changes. The result is a converter you can actually trust for real scheduling decisions.
How to Use the Timezone Converter
Start by selecting your source timezone — this defaults to your detected local timezone. Toggle "Use current time" off if you want to convert a specific date and time instead of the live clock. Next, add target timezones using the search box or the quick-add buttons. The converter instantly displays the equivalent time in each target zone, along with the timezone abbreviation, UTC offset, hour difference from the source, and whether daylight saving time is currently active. Click the X button on any target card to remove it.
Key Features
- 40+ timezones covering every major city and UTC offset worldwide.
- Automatic DST detection — the tool shows a DST badge when daylight saving time is active in any zone.
- Live clock mode — leave "Use current time" enabled to see all clocks tick in real time.
- Custom date & time — plan ahead by converting a specific future or past date/time.
- Hour difference — each target card shows the relative offset from the source (e.g., +5:30h).
- Quick-add buttons — one-click shortcuts for the most commonly used timezones.
- Fully private — everything runs in your browser using the native Intl API. Nothing is sent to a server.
Understanding Time Zones & DST
The world is divided into roughly 24 standard time zones, each offset from Coordinated Universal Time (UTC). However, many regions observe daylight saving time (DST), shifting their clocks forward by one hour during warmer months. This means the offset between two cities can change depending on the time of year — London and New York are 5 hours apart in winter but only 4 hours apart during summer DST overlap. Not all countries observe DST: much of Asia, Africa, and parts of the Americas stay on standard time year-round.
Some regions use non-standard offsets. India follows UTC+5:30, Nepal uses UTC+5:45, and the Chatham Islands in New Zealand use UTC+12:45. Australia has three main zones plus a half-hour offset in parts of South Australia and the Northern Territory. This converter handles all of these correctly because it relies on the IANA time zone database (also known as the Olson database), the same source used by operating systems and programming languages worldwide.
Common Use Cases
- Remote teams — find overlapping working hours across distributed teams.
- International meetings — schedule calls and meetings that respect everyone's business hours.
- Travel planning — know exactly what time it will be at your destination when you arrive.
- Live events — convert event start times (conferences, webinars, streams) to your local time.
- Forex & crypto trading — track market open/close times across global exchanges.
- Customer support — determine the local time for customers before reaching out.
Frequently Asked Questions
How does this converter handle daylight saving time?
The converter uses your browser's built-in Intl API, which references the IANA timezone database. When DST is active in a timezone, the tool automatically adjusts the offset and displays a "DST" badge. You do not need to manually account for DST changes.
Can I convert a specific date and time instead of now?
Yes. Uncheck the "Use current time" toggle, then enter the date and time you want to convert. This is useful for scheduling future meetings or determining what time a past event occurred in a different timezone.
What is UTC and why does it matter?
UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. It does not observe daylight saving time and serves as the baseline for all timezone offsets. When you see "UTC+5:30", it means that timezone is 5 hours and 30 minutes ahead of UTC.
Why do some timezones show half-hour or 45-minute offsets?
While most timezones follow whole-hour offsets from UTC, several regions adopted non-standard offsets for geographic or political reasons. India uses UTC+5:30, Nepal uses UTC+5:45, and Iran uses UTC+3:30. These are fully supported by this converter.
Is my data shared when I use this tool?
No. All conversions happen entirely in your browser using JavaScript's native Intl API. No data — including the times you convert or the timezones you select — is sent to any server.