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🕐 Time Zones

Time Zone Finder

Find the time zone of any location on Earth using coordinates or a city name.

This page explains how the time zone finder works, the data and formulas behind it, and how to interpret the result. The IANA database is the global source of truth for civil time. It records the political boundaries and DST rules for every region on Earth, and is embedded in every major operating system, programming language and calendar app. The tool is one of 329 free, open tools on JoseFitani for maps and geography. It runs in your browser with no sign-up needed. Use the search field or click the map to drop a pin - the tool uses the IANA time zone database via the browser's Intl.DateTimeFormat API and returns the result in seconds. Below you'll find a step-by-step guide, real use cases, the methodology, FAQs, and data sources.

Offset lookup: type an IANA time zone identifier (e.g. Asia/Kolkata, America/New_York) to see its current local time, UTC offset and DST status. This tool does not use a map.

Current local time
Friday, October 9, 2026 at 01:34:27 PM GMT+2

How to use this tool

1
Enter your input

Type your query, paste coordinates, or click on the map. The tool uses the IANA time zone database via the browser's Intl.DateTimeFormat API to process your input locally in the browser.

2
View the result

The result appears instantly with the map showing your location. You can adjust by clicking elsewhere or searching a new place.

3
Copy or share

Click Copy to save to clipboard, or Share to send a direct link with the exact inputs.

What people use this tool for

Flight arrival time math

Travellers convert a departure and arrival into local times at both ends to plan pickups and hotel check-ins. Looking up the destination's zone gives the IANA name and UTC offset in one step. The DST flag settles whether the offset is the summer or winter one.

Example: A flyer heading from London to Singapore looks up Changi's zone to confirm the arrival lands at 7 am local, not the 11 pm the departure board seemed to imply.
Remote team scheduling

Managers with staff on three continents check each member's zone before proposing a standup slot. The offset column shows at a glance who would be dragged in at midnight. Picking the overlap keeps the meeting humane for everyone.

Example: A team lead with engineers in Berlin, Lagos, and San Francisco checks all three zones and lands on a 3 pm UTC slot that suits each city.
Astronomy observation planning

Amateur astronomers convert event times from UTC almanacs into local time at a dark-sky site. The finder confirms the site's offset and whether daylight saving is in force that night. That pins down when a meteor shower peaks overhead.

Example: An observer driving to a desert site outside Jaipur checks the zone to convert the Perseid peak from UTC to local time.
Voyage log timestamps

Sailors logging positions across ocean passages record each fix in the local zone of the nearest port. The finder gives the zone name that belongs in the logbook entry. Consistent zone labelling keeps the passage record unambiguous for customs and insurers.

Example: A skipper crossing from the Canaries to Barbados notes each noon position with the zone the finder reports for the nearest landfall.

How it's calculated

Time zones are determined by a combination of longitudinal position and political boundaries.

The calculation runs in your browser - no data is sent to our servers. Map tiles come from OpenStreetMap (ODbL license), geocoding uses Nominatim (1 request/second limit), and elevation uses the Open-Elevation API backed by SRTM data. All are free, open services.

All calculations use the WGS84 datum (EPSG:4326), the same as GPS. For other datums (NAD27, NAD83, ETRS89), a separate conversion is needed. The difference is typically under 1 metre - negligible for most uses but important for survey-grade work.

The formulas match those in professional GIS software (QGIS, ArcGIS, Global Mapper), just in a browser-friendly form. For sub-metre accuracy, use professional software with ellipsoidal calculations. Results are shown in multiple units: km and miles for distance, km²/m²/hectares/acres for area, metres and feet for elevation. Conversion factors are exact (1 mile = 1.609344 km), so the only error source is input precision.

Related tools and resources

For more tools in this category, explore the related tools listed below. Each tool includes full documentation, examples and FAQs. Explore related tools in our Timezones category for complementary functionality. See the Tools index for all 329 tools, or read our blog for in-depth articles on geography and maps.

Frequently asked questions

Does this handle DST?

Yes - IANA zones include daylight saving rules.

What is an IANA time zone name?

It is the standard identifier for a time zone, written as a region and city such as America/New_York or Asia/Kolkata. Unlike abbreviations like EST, which are ambiguous and reused worldwide, the IANA name points to one exact rule set. Software uses these names to compute local time correctly through history.

Does the result account for daylight saving time?

Yes. The finder reports the zone's current UTC offset and whether daylight saving is in effect right now. The IANA database behind the names encodes every DST transition, so the offset shown matches today's date. A zone on standard time in January may show a different offset in July.

Why do some places have half-hour or 45-minute offsets?

Time zones are political, not purely geographic, so governments choose offsets that suit them. India uses UTC+5:30, Nepal uses UTC+5:45, and parts of Australia use +9:30. The finder reports whatever offset the location's zone actually observes, including the odd ones.

How is the zone determined from coordinates?

The tool matches your coordinates against time-zone boundary data to find which zone polygon contains the point. Near borders this matters: two towns a few kilometres apart can sit in different zones. Zoom in close before dropping the pin so the match reflects the right side of the line.

Can time zones change over time?

Governments change them more often than people expect: countries have abolished daylight saving, shifted their standard offset, or moved across the date line. The IANA database tracks these changes with dated releases. If a country announces a change, the finder reflects it once the underlying data is updated.

What is the difference between UTC offset and the zone name?

The offset is a number, such as +5:30, that tells you how far local time sits from UTC at this moment. The zone name is the full identity that knows how the offset changes through the year. Two places can share an offset today and diverge next month when only one observes daylight saving.

Why does the abbreviation sometimes look unfamiliar?

Abbreviations are not standardised the way IANA names are: the same letters can mean different zones in different countries. The finder shows the IANA name as the reliable identifier and the abbreviation as a convenience. When in doubt, trust the region/city name.

Does the time zone lookup need the internet?

The zone lookup runs against boundary data bundled with the page, so after loading it works in the browser without a connection. The current-time display simply reads your device clock. No account, no tracking, and no server round trip are involved in the lookup itself.

Data sources & methodology