Timezone Converter Online – Free Time Zone Conversion
Convert time between any timezones instantly. Time Shuttle uses the full IANA timezone database and handles daylight saving time automatically — no manual offset calculations needed.
How Timezone Conversion Works
Timezones are regions of the Earth that observe the same standard time. The IANA timezone database (also called the Olson database) is the global standard for timezone information, maintained by ICANN. It contains hundreds of timezones, each identified by a region/city name like America/New_York or Asia/Tokyo.
Time Shuttle uses the browser's native Intl.DateTimeFormat API to convert between timezones. This API references the IANA database and automatically handles daylight saving time (DST) transitions, historical timezone changes, and regional rules. There are no hardcoded UTC offsets — every conversion is accurate.
How to Use the Timezone Converter
- Enter a time: Type a Unix timestamp or a human-readable date into the input field.
- Select the source timezone: Choose the timezone the original time is in. Your local timezone is selected by default.
- Select the target timezone: Choose the timezone you want to convert to. UTC is the default target.
- View the result: The converted time appears instantly. Click Copy to save it to your clipboard.
Supported Timezones
Time Shuttle supports all timezones in the IANA database, including major zones like UTC, EST, PST, CET, JST, IST, and hundreds more. The full list includes:
- Americas: New York, Los Angeles, Chicago, São Paulo, Buenos Aires, and more.
- Europe: London, Paris, Berlin, Moscow, Istanbul, and more.
- Asia: Tokyo, Shanghai, Mumbai, Dubai, Singapore, and more.
- Pacific: Sydney, Auckland, Honolulu, and more.
- Africa: Cairo, Lagos, Nairobi, Johannesburg, and more.
Daylight Saving Time (DST)
Many regions observe daylight saving time, where clocks are advanced by one hour during warmer months. DST rules vary by country and change over time. Time Shuttle handles DST automatically because it relies on the browser's Intl API, which is updated with the latest IANA timezone data.
For example, when converting from America/New_York to Europe/London, the tool correctly accounts for the fact that the US and EU switch to/from DST on different dates.