Timezone Converter
Convert a date and time between any two world time zones, with daylight-saving handled automatically and the exact UTC offsets and difference shown. Runs entirely in your browser.
Converted time
-
How it works
A time zone is just an offset from Coordinated Universal Time (UTC), and many zones shift that offset twice a year for daylight saving time. To convert, the tool turns your source wall-clock time into an absolute instant in UTC, then re-expresses that same instant in the target zone.
target time = source time − source offset + target offset
Offsets are read from your browser's built-in time-zone database for the exact date you pick, so daylight-saving changes are handled automatically. Everything runs locally, no clock data leaves your device.
What this does
A timezone converter changes a date and time from one world time zone to another, applying daylight-saving automatically and showing each zone’s UTC offset and the difference between them.
How to use it
- Pick the source zone and enter a date and time.
- Pick the destination time zone.
- Read the converted local time and the offset.
- Swap the zones to convert the other way.
Example
12:00 in New York (UTC−5 in winter) is 17:00 in London (UTC+0), a five-hour difference.
Last updated .
Frequently asked questions
Are daylight-saving changes handled?
Yes. The offset for each zone is read from your browser’s time-zone database for the exact date you choose, so daylight-saving shifts are applied automatically on either side of the conversion.
Where does the time-zone data come from?
From the IANA time-zone database built into your browser, accessed through the standard Intl API. No external service is contacted.
Is my data stored?
No. Everything is calculated locally in your browser.
Related tools
Length Converter
Convert length and distance between metric and imperial units, millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles. Calculates in your browser.
Weight Converter
Convert weight and mass between metric and imperial units, milligrams, grams, kilograms, metric tons, ounces, pounds, and stones. Calculates in your browser.
Volume Converter
Convert volume between metric and US/UK units, milliliters, liters, cubic meters, teaspoons, tablespoons, cups, pints, quarts, and gallons. Calculates in your browser.
Area Converter
Convert area between metric and imperial units, square millimeters, centimeters, meters, kilometers, hectares, square inches, feet, yards, acres, and square miles. Calculates in your browser.