Convert a date and time between any two time zones, with daylight saving handled automatically.
Compare more zones
🔒 This tool runs entirely in your browser. Nothing you enter or upload is sent to our servers.
How to use the Time Zone Converter
- Set the date and time and choose the zone it's in (defaults to your local zone, now).
- Choose the target zone — the converted time and the offset difference appear instantly.
- Add extra zones to compare several places at once for a meeting.
About this tool
This converter uses the IANA time zone database built into your browser, so daylight saving rules are applied automatically for the date you pick — no need to work out whether a city is on summer or winter time.
Zone names such as America/New_York are used instead of ambiguous abbreviations (there are several different "CST"s in the world).
Frequently asked questions
What is UTC?
Coordinated Universal Time is the reference all other zones are defined against. GMT is, for practical purposes, the same thing.
Why does the difference between two cities change during the year?
Daylight saving time. Many countries shift their clocks by an hour in summer, and not all do it on the same dates.
Can I convert a time in the past or future?
Yes. Pick any date; historical and scheduled DST rules known to your browser are applied.