# 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.

> Canonical page: https://elysiatools.com/en/tools/timezone-lookup-by-coordinates

- **Category:** Geography

- **Keywords:** timezone, time zone, latitude, longitude, coordinates, iana timezone, utc offset, dst, daylight saving, geo, gps, lat lon, timezone finder, world clock, meeting scheduler

## Overview

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

1. **Input** — enter latitude (−90..90) and longitude (−180..180).
2. **Match** — the tool finds the nearest reference city in its built-in database (great-circle distance) and assigns that city's IANA timezone.
3. **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.
4. **Local time** — shows the wall-clock time at the point right now.
5. **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.

## Inputs

- **Latitude** (number): e.g. 39.9042 (Beijing)
- **Longitude** (number): e.g. 116.4074 (Beijing)
- **Decimal places** (number): 2

## When to use

- When scheduling international meetings or events and you only have the geographic coordinates of the participants.
- When normalizing server logs, GPS tracking data, or IoT telemetry coordinates into their respective local timezones.
- When planning logistics or travel routes and needing to verify local wall-clock times and DST offsets offline.

## How it works

- Enter the latitude (-90 to 90) and longitude (-180 to 180) coordinates of the target location.
- The tool calculates the great-circle distance to find the nearest reference city within its built-in offline database.
- It determines the IANA timezone name, computes the current UTC offset, and approximates the daylight saving time (DST) status based on month-band rules.
- The tool outputs the local wall-clock time, standard/current offsets, and a list of nearby reference cities with their distances.

## Use cases

- Resolving GPS coordinates from IoT devices to determine local operating hours.
- Normalizing cross-border shipping logs to local times for delivery window analysis.
- Identifying the correct timezone for remote team members based on their city coordinates to schedule meetings.

## Frequently asked questions

### 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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