How does the tool find the timezone for a coordinate?

It calculates the great-circle distance to the nearest reference city in its built-in database and assigns that city's IANA timezone.

Does this tool require an internet connection to work?

No, it operates fully offline using a built-in city and timezone reference database.

How accurate is the daylight saving time (DST) calculation?

DST status is approximated using month-band rules for speed. For legal or critical applications, verify exact transition dates against the official IANA database.

What coordinate formats does the tool accept?

It accepts decimal degrees for latitude (from -90 to 90) and longitude (from -180 to 180).

Can I adjust the precision of the output?

Yes, you can configure the decimal places precision option from 0 to 6.

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Geography

Timezone Lookup by Coordinates

Find the IANA timezone for any latitude / longitude: returns the timezone name (e.g. Asia/Shanghai), the current UTC offset, whether daylight saving time is active, the local wall-clock time, and the nearest reference cities. Fully offline — uses a built-in city/timezone reference database with nearest-reference matching.

Details

What this tool helps you do

A coordinate → timezone resolver for cross-border business, logistics, remote-meeting scheduling and log normalisation:

Input — enter latitude (−90..90) and longitude (−180..180).
Match — the tool finds the nearest reference city in its built-in database (great-circle distance) and assigns that city's IANA timezone.
Offset & DST — it computes the current UTC offset and whether DST is active using month-band rules (northern/southern hemisphere), reporting both standard and current offsets.
Local time — shows the wall-clock time at the point right now.
Nearest points — lists the closest reference cities with their timezones and distances, so you can judge accuracy.

All data is offline and deterministic. DST transition dates are approximated by month-band for speed — ideal for planning, but confirm exact transitions against the IANA tz database for legal use.

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Samples

Timezone Lookup by Coordinates

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Key facts

Overview

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How it works

Use cases

Examples

1. Resolving Beijing Coordinates

2. Checking DST Status for New York Coordinates

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