github.com/albertyw/localtimezone

github.com/albertyw/localtimezone

LatLong conversion to time zone. This is a fork of github.com/ugjka/go-tz.

Usage / Example

import "github.com/albertyw/localtimezone"

// Loading Zone for Line Islands, Kiritimati
zone, err := tz.GetZone(tz.Point{
    Lon: -157.21328, Lat: 1.74294,
})
if err != nil {
    panic(err)
}
fmt.Println(zone[0])

Uses simplified shapefile from timezone-boundary-builder

GeoJson Simplification done with mapshaper

Features

• The timezone shapefile is embedded in the build binary
• Supports overlapping zones
• You can load your own geojson shapefile if you want
• Sub millisecond lookup even on old hardware

Problems

• Shapefile is simplified using a lossy method so it may be innacurate along the borders
• This is purely in-memory. Uses ~50MB of ram

Updating data

Get the most current timezone release version at https://github.com/evansiroky/timezone-boundary-builder/tags

go run tzshapefilegen/main.go -release [2021c]

Licenses

The code used to lookup the timezone for a location is licensed under the MIT License.

The data in timezone shapefile is licensed under the Open Data Commons Open Database License (ODbL).