Click the map, search a place, paste coordinates, or use Detect My Location to find the time zone and current local time for any point on Earth. Tap "Detect My Location" — the tool reads your GPS and looks up the IANA time zone for your coordinates (e.g. America/New_York). You get the IANA name, the human-readable name (Eastern Standard Time / EST), the current local time, and whether DST is active. Yes. The tool uses the IANA time zone database (also called the tz database), which covers all ~440 time zones in the world. Click any point — land, ocean, or polar — and it returns the correct zone, including unusual ones like Asia/Kathmandu (UTC+5:45) and Pacific/Chatham (UTC+12:45). Time zone polygons come from the timezone-boundary-builder project, a widely-used timezone-boundary dataset. DST rules and historical changes are tracked by the IANA tz database, updated several times per year as countries change their clocks. Yes — no sign-up, no API key, no usage limits. This tool runs the lookup server-side using the open-source geo-tz library. What is a time zone? How to find your time zone Major world time zones Daylight saving explained Methodology & data sources How this compares to alternatives Limitations & accuracy notes Frequently asked questions What is a time zone, and what time zone am I in? A time zone is a region of Earth that observes the same standard time. The naive picture is that the planet is divided into 24 zones, each one hour wide and 15° of longitude across. The reality is messier: there are actually about 440 distinct time zones in the IANA database, because political borders, half-hour offsets (India, Newfoundland), quarter-hour offsets (Nepal, Chatham Islands), and country-specific DST rules all create exceptions. What time zone am I in? Tap the "Detect My Location" button at the top of the tool. The tool reads your GPS coordinates, looks them up in the IANA tz database via the open-source geo-tz library, and returns your time zone — the IANA identifier (like America/New_York ), the human-readable name (Eastern Standard Time), the current UTC offset, the live local time, and whether daylight saving is in effect right now. The whole process takes about a second. People look up time zones for meetings, travel, calls with family abroad, scheduling cron jobs and deployments, planning trips, making sense of timestamps in databases, and just plain curiosity. Whatever your reason, this tool gives a complete answer: not just the zone but the live local time, the offset, the DST status, and a side-by-side comparison with 8 major world cities. How to find your time zone Major world time zones A reference table of common time zones. Where two offsets are listed (e.g. UTC−5 / −4 ), the first is standard time and the second is daylight saving time. Daylight Saving Time explained Daylight Saving Time (DST) is the practice of advancing clocks by one hour during summer to align active hours with sunlight. About 70 countries (covering ~1 billion people) observe DST in some form. Most of Asia, Africa, and tropical regions do not. DST rules change regularly as countries adopt or abolish them. The IANA tz database is updated several times per year to track these changes, and geo-tz ships new releases shortly after each update. The DST badge in the result hero tells you whether DST is currently active for your selected location. Who uses time zone lookups 1. International meetings and remote teams Distributed teams use time zone lookups to schedule meetings without offending anyone. The world-clock cards show the current time in 8 major cities so you can pick a slot that works for everyone. 2. Travel planning Travelers check destination time zones to plan calls home, sleep schedules, and arrival timing. The DST badge tells you whether your destination is currently on daylight saving — important for arrival timing in March, October, and November. 3. Scheduling cron jobs and deployments Engineers scheduling automated jobs need the IANA time zone for the relevant region. A cron schedule for "9 AM Tokyo time" should use Asia/Tokyo , not a fixed UTC offset, so DST adjustments are handled automatically.

4. Database design and migrations Database engineers store timestamps in UTC and convert at the edge using each user's time zone. This tool gives the canonical IANA name to store in user profiles or location columns. 5. Customer support and SLA tracking Support teams handling customers in multiple regions use time zones to honor response-time SLAs and avoid contacting people at 3 AM. The world-clock cards give an instant view of working hours across regions. 6. Legal and compliance work Contracts, court filings, and statutory deadlines are typically in the local time of the relevant jurisdiction. Lawyers verify the time zone to compute cutoffs and avoid late filings. 7. Astronomy and event timing Astronomers, solar viewers, and event planners convert times for solar eclipses, meteor showers, and rocket launches into local times for viewers around the world. 8. Education and reference Teachers and students use time zone lookups to learn world geography, understand why countries are on different clocks, and study the politics of time zones (China spans 5 geographic zones but uses only one). Methodology & data sources Time zone polygons come from the timezone-boundary-builder project, which builds shapefiles from OpenStreetMap administrative boundaries and the IANA tz database. The lookup runs server-side via the geo-tz Node library. DST rules and historical changes are tracked by the official IANA tz database, updated several times per year. Live local time Once the IANA name is known, the tool uses the browser's Intl.DateTimeFormat API with the timeZone option to format the current system time in that zone. The display ticks every second using a 1-second JavaScript interval. As long as your system clock is correct (which it normally is, since modern OSes sync via NTP), the displayed time is accurate to the second. UTC offset calculation UTC offset is computed by formatting the same instant in two zones (UTC and the target zone) and taking the difference. This automatically accounts for DST and historical offset changes. The result is shown in ±HH:MM format and supports non-hour offsets like UTC+5:30 (India) and UTC+5:45 (Nepal). DST is detected by computing the UTC offset on January 1 and July 1 of the current year, then comparing today's offset to the smaller of those two. If today's offset is greater, DST is in effect. This works correctly for both Northern and Southern Hemisphere zones. Address autocomplete & reverse geocoding Address suggestions in the search box come from Photon , and the place name shown for each result comes from Nominatim — both built on OpenStreetMap. Limitations & accuracy notes Accuracy depends on system clock. The displayed local time is your system clock formatted to the target zone. If your computer's clock is wrong (rare with modern NTP), the displayed time will be wrong by the same amount. Boundary precision is OSM-level. Time zone polygons are built from OpenStreetMap administrative boundaries. At country borders, accuracy is ~10 m. In disputed regions, the polygon follows OSM's convention, which may not match every government's view. Historical changes only since 1970. The IANA tz database accurately tracks DST and offset changes since 1970. For dates before then, the database falls back to local mean time, which may not match historical record-keeping. DST rules change. Countries occasionally change their DST rules, and the tz database is updated to match. Until the new release reaches this tool, the displayed status may be outdated for the affected country. Server-side lookup requires internet. The time zone lookup calls a server endpoint. If your connection is offline, the lookup will fail. For offline use, install a tz database wrapper locally. Related tools and resources Want the whole-country picture instead of a single point? The US Time Zone Map is an interactive map of every US time zone — Eastern, Central, Mountain, Pacific, Alaska, and Hawaii — with live local times, split states like Florida, and Arizona's no-DST area shown distinctly. To compare working hours across two to five cities at once with a live overlap visualization, see the Time Difference Calculator . For sunrise, sunset, twilight, and golden-hour times at any location, see the Sunrise & Sunset Calculator . To see exactly where the sun is at any specific moment in any time zone — solar azimuth, elevation, and shadow direction — see the Sun Position Calculator . To find latitude and longitude for any location, use the Latitude & Longitude Finder . To find the elevation, use the Elevation Finder . For distance and radius work, see Distance Between Two Places and the Map Radius Tool . Browsing the US by state? Each state has a county directory: Frequently asked questions Time zone polygons and DST rules from the IANA Time Zone Database via the timezone-boundary-builder project, served through the geo-tz library. Live time formatting via Intl.DateTimeFormat in the browser. Map rendering by MapLibre GL JS with OpenFreeMap tiles. Address autocomplete by Photon and reverse geocoding by Nominatim . More free map tools