Time Zone Converter

Every conversion uses the real offset for the exact date you enter, not a fixed offset. So a New York to London conversion in January uses EST and GMT, while the same conversion in July uses EDT and BST. You never have to set DST yourself.

The converter still returns a valid result instead of erroring. On the US spring-forward Sunday, clocks jump from 2:00 AM straight to 3:00 AM, so a time like 2:30 AM never exists. The converter resolves it to the instant just before the gap, which reads as 1:30 AM standard time.

DST does not start and end on the same weekend everywhere. The US springs forward on the second Sunday of March, but the UK and EU wait until the last Sunday. For those few weeks the gap between New York and London is 4 hours instead of the usual 5, and most US-Europe pairs shift the same way.

You get 15 common business zones: all six main US zones from Eastern to Hawaii, plus London, Paris, Berlin, Tokyo, Shanghai, Mumbai, Dubai, Sydney, and UTC. Conversions read from the IANA time zone data built into your browser, so the DST rules stay current.

Yes. A label like GMT-5 or GMT+1 reflects the offset on the exact date and time you entered, not a generic year-round value. That is why one city can show GMT-5 for a January date and GMT-4 for a July date.