public Time Zone Difference Calculator star

How It Works

Every city carries two separate pieces of time information: a fixed UTC offset for its time zone, and — for many countries — a seasonal daylight saving time (DST) adjustment that shifts the clock forward or back at specific dates each year. Neither of these is universal. The offsets themselves are not always whole hours: India runs at UTC+5:30, Nepal at UTC+5:45, Iran at UTC+3:30 and Newfoundland at UTC−3:30, so a perfectly normal difference between two cities can land on :30 or :45 rather than a clean hour. On top of that, the dates DST starts and ends are set independently by each country or bloc — the European Union changes clocks on the last Sunday of March and October, while the United States changes on different dates in March and November — so for part of the year one city may have already sprung forward while the other has not yet moved, temporarily shifting the gap between them by a full hour compared to the rest of the year.

This tool reads the current local time for both cities directly from your browser's built-in IANA time-zone database — the same database operating systems and phones use — rather than from a static lookup table, so the difference shown is whatever is actually in effect for the current date, not a number that goes stale every time a country changes its DST rules. Concrete example: in January, New York (UTC−5) and Madrid (UTC+1) are 6 hours apart; by July, New York has moved to UTC−4 for its own daylight saving while Madrid has moved to UTC+2, so the two cities are still 6 hours apart — but if only one of the two observed DST at all, that gap could shift by a full hour depending on the date checked.

Pick your own city and the one you are curious about — by typing a name, clicking the world map, or tapping auto-detect — and the tool displays both live clocks side by side, each current UTC offset, the exact difference between them, and a converter that answers "when it is 9:00 where I am, what time is it there?" instantly, for any time of day you type in.

What to Know

Auto-detection asks your browser for location permission first; if you decline, or if it is unavailable, the tool simply falls back to the time zone your device is already set to. Either way, no coordinate or location data is ever sent to a server — the lookup happens entirely on your device.

Because DST start and end dates are set by national law rather than by geography, the hour difference between two specific cities is not fixed year-round — it can be one value for most of the year and briefly a different value for a few weeks in spring or autumn, exactly when one region has changed its clocks and the other has not yet. If a scheduled call or flight lands near a DST transition date, it is worth double-checking the difference for that exact date rather than assuming it matches the rest of the year.

If your exact town is not listed, pick the nearest listed city that shares the same time zone — time zones typically span whole countries or large regions, so the result is identical as long as the two share a zone, regardless of the distance between the actual towns.