tzdb (Time Zone Database)

tzdb is a library to determine whether the time is in daylight saving time.

IANA Time Zone Database

The data returned and used by TZInfo is sourced from the IANA Time Zone Database. The Theory and pragmatics of the tz code and data document gives details of how the data is organized and managed.

Installation

go get -u github.com/tiechui1994/tzdb

Example Usage

package main

import (
    "fmt"
    "time"
    
    "github.com/tiechui1994/tzdb"
)

func main() {
    loc, _ := time.LoadLocation("America/Chicago")
    timeFormat := "2006-01-02 15:04:05"
    
    testz, _ := time.ParseInLocation(timeFormat, "2021-03-14 01:59:00", loc)
    fmt.Println(testz, testz.UTC(), tzdb.IsDST(testz))
    
    testz = testz.Add(time.Minute)
    fmt.Println(testz, testz.UTC(), tzdb.IsDST(testz))
    
    testz = testz.Add(time.Minute)
    fmt.Println(testz, testz.UTC(), tzdb.IsDST(testz))
}

Update location zoneinfo

curl https://raw.githubusercontent.com/tiechui1994/tzdb/main/scripts/update.sh | sudo sh -