# TzWorld v2.5.0 - Table of Contents

Resolve time zone names from a location.

## Pages

- [TzWorld](readme.md)
- [LICENSE](license.md)
- [CHANGELOG](changelog.md)

- Guides
  - [Performance](performance.md)

## Modules

- [TzWorld](TzWorld.md): Resolves the time zone at a location from its coordinates.

- Backends
  - [TzWorld.Backend](TzWorld.Backend.md): The behaviour a time zone lookup backend implements.
  - [TzWorld.Backend.DetsWithIndexCache](TzWorld.Backend.DetsWithIndexCache.md): Resolves a timezone from a coordinate using a DETS file of timezone
shapes together with an in-memory index of their bounding boxes.
  - [TzWorld.Backend.EtsWithIndexCache](TzWorld.Backend.EtsWithIndexCache.md): Resolves a timezone from a coordinate using an ETS table of timezone
shapes, populated from the DETS cache at startup.
  - [TzWorld.Backend.SpatialIndex](TzWorld.Backend.SpatialIndex.md): Resolves timezones from a coordinate using an R-tree spatial index
held in `:persistent_term`.

- Internals
  - [TzWorld.Downloader](TzWorld.Downloader.md): Downloads the time zone boundary data from the
[timezone-boundary-builder](https://github.com/evansiroky/timezone-boundary-builder)
releases on GitHub.
  - [TzWorld.PackedGeometry](TzWorld.PackedGeometry.md): Time zone shapes compiled for fast, exact point-in-polygon tests.

## Mix Tasks

- Mix tasks
  - [mix tz_world.update](Mix.Tasks.TzWorld.Update.md): Downloads and installs the latest Timezone GeoJSON data.