About Timezone Converter — Time Across Zones (UTC)
Coordinating a call across continents, or reading a log line stamped in a region you don't live in, means doing timezone math in your head — and getting daylight saving wrong by an hour. This timezone converter does it for you: enter a date and time, pick the source zone, and see the same instant rendered in any target zone, with its exact UTC offset.
Because it leans on your browser's built-in IANA timezone database via the Intl APIs, every conversion is DST-aware — summer and winter offsets are handled automatically, with no hand-rolled tables to drift out of date. It also runs entirely on your device: no time, date, or zone you enter ever leaves your browser.
Features
- Convert a time between any two IANA timezones
- DST-aware — correct summer vs winter UTC offsets
- Accepts date strings, Unix timestamps, or "now"
- Fully offline; uses the browser Intl timezone database
How to use
- Enter a date/time, a Unix timestamp, or "now" in the input.
- Choose the source timezone and the target timezone from the dropdowns.
- Read the converted time and UTC offset for each zone in the output.
- Press Now to reset the input to the current instant.
Frequently asked questions
Does it account for daylight saving time?
Yes. Offsets come from the browser Intl timezone database, so a zone like America/New_York correctly shows UTC-04:00 in July and UTC-05:00 in January without any manual adjustment.
How is a plain time like "2024-07-01 09:00" interpreted?
As wall-clock time in the source timezone you selected. The tool resolves it to an absolute instant, then renders that instant in the target zone. A value ending in Z or a ±HH:MM offset is treated as already absolute.
Where does the list of timezones come from?
From Intl.supportedValuesOf("timeZone") — the IANA zone names your browser ships. That is why the list is comprehensive and always matches the offsets used for conversion.
Is my data sent anywhere?
No. The conversion runs entirely in your browser using built-in platform APIs. Nothing you type is uploaded or stored on a server.
Related tools
Everything runs locally in your browser — your input is never uploaded.