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.
How it works
The offset for each zone is read from your browser’s IANA time-zone database for the exact date chosen, through the standard Intl API, so daylight-saving shifts are applied on both sides automatically. No external service is contacted.
Example
12:00 in New York (UTC−5 in winter) is 17:00 in London (UTC+0), a five-hour difference.
Sources & methodology
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.
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