Convert a date and time from one time zone to another, with UTC offsets, daylight saving handled automatically and live current time in both zones. Free, in your browser.
How the time zone conversion works
Your browser ships the full IANA time zone database — the same one operating systems use — and this tool queries it through the built-in Intl API rather than a lookup table of fixed offsets. The wall-clock time you enter is resolved to an exact universal instant using the source zone's rules for that specific date, then that instant is re-expressed in the target zone. Because the rules are date-aware, daylight saving is handled automatically: New York is UTC−05:00 in January and UTC−04:00 in July, and half-hour zones like India's UTC+05:30 just work.
new Intl.DateTimeFormat("en", { timeZone }).formatToParts(instant)Frequently asked questions
Is anything I enter uploaded to a server?
No. The conversion runs locally in your browser using its built-in time zone database — nothing is uploaded, logged or stored. The date, time and the two zones appear in the page URL so you can share a preconfigured conversion link.
Does it handle daylight saving time?
Yes, automatically. The offset is looked up for the exact date you enter, not assumed constant — so converting a July meeting from London uses BST (UTC+01:00) while a December one uses GMT (UTC+00:00). Around the DST switch itself, times that occur twice or never are resolved to the nearest valid instant.
Which time zones are available?
Every zone your browser knows from the IANA database — typically 400+, named by region and city like Asia/Kolkata or America/New_York. City names are used because countries change their rules; the database tracks each region's actual history. On very old browsers a curated list of major zones is offered instead.
Last updated: 8 July 2026
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