County Maps US

Tools Elevation, time and sun

Time Zone Finder

Search a place and get its zone. A row of world cities underneath shows what time it is there at the same moment.

How to use it

  1. Type a city, address or "lat, lng", or click the map, or press "Use my location".
  2. Read the zone name, its offset from UTC, whether daylight saving time is in effect and the local time, which ticks live.
  3. Compare with the eight world cities below, each shown at the same instant.

How it works

The place is turned into a coordinate by the Photon geocoder (or taken from your GPS), and the coordinate is matched to an IANA zone in your browser by the tz-lookup library, which holds a compressed raster of zone boundaries accurate to a few kilometres. The zone’s offset, name, daylight-saving state and current time then come from the browser’s Intl database. No time service is called.

Daylight saving is detected by comparing the zone’s January and July offsets with its offset right now. The "compared with your clock" line uses the zone your browser reports for itself.

Questions

What is an IANA zone name?
The standard identifier for a time zone region, such as America/Chicago or Europe/Berlin, used by every operating system and programming language. It carries the full history of that region’s offsets and daylight saving rules, which a plain "UTC-6" does not.
Why does the offset differ from what I expected?
Most likely daylight saving time: New York is UTC-5 in winter and UTC-4 in summer. The page shows the offset in force right now and says whether DST is active.
Can I look up a time zone by coordinates?
Yes. Type the latitude and longitude as "40.71, -74.00" or click the exact point on the map.

All map tools, free and without an account. Location data is processed in your browser and by the open geocoding services named on the sources page; nothing is stored by this site.