Set Golang Standard Timezone

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Is there any way to set a standard Timezone (Location) in Golang so you don’t have to be on time?

I am currently manually setting the Timezone every time I need to work with Time using it:

loc, _ := time.LoadLocation("America/Sao_Paulo")
tim := time.Now().In(loc)
time golang

4 answers

2


You can set to váriavél time.Local. According to the documentation:

var Local *Location = &localLoc

Local represents the system’s local time zone. On Unix systems, Local > consults the TZ Environment variable to find the time zone to use. No > TZ Means use the system default /etc/localtime. TZ="" Means use UTC. > TZ="foo" Means use file foo in the system Timezone directory.

Then you can use to change the Location.

For example:

time.Local = time.UTC

Thus in executing the time.Now() will be in UTC.

In the case of America/Sao_Paulo just do:

time.Local, _ = time.LoadLocation("America/Sao_Paulo")

This can be stated in main() and all subsequent calls will use that time zone.

If you take a test:

func main() {
    fmt.Println("Tempo padrão:", time.Now())

    time.Local = time.UTC
    fmt.Println("Tempo UTC:", time.Now())
    fmt.Println("Tempo UTC:", time.Now())

    time.Local, _ = time.LoadLocation("America/Sao_Paulo")
    fmt.Println("Tempo SP:", time.Now())
    fmt.Println("Tempo SP:", time.Now())
}

Upshot:

Tempo padrão: 2021-06-17 15:28:04.5675042 +0100 BST m=+0.092369601
Tempo UTC: 2021-06-17 14:28:04.5844768 +0000 UTC m=+0.109342201
Tempo UTC: 2021-06-17 14:28:04.5844768 +0000 UTC m=+0.109342201
Tempo SP: 2021-06-17 11:28:04.5844768 -0300 -03 m=+0.109342201
Tempo SP: 2021-06-17 11:28:04.5844768 -0300 -03 m=+0.109342201

  • Ball show! It worked perfectly! Can you tell me if there has always been this variable? Because years ago when I researched I found nothing.

  • It has always existed, at least since Go 1.0.1, there from ~2012. You can see the source code at https://go.googlesource.com/go/+/refs/tags/go1.0.1/src/pkg/time/zoneinfo.go#57.

  • I get it. Strange that when I researched I didn’t find this anywhere, and I researched a lot, very much, then as I didn’t find anything at the time I ended up creating a function that initializes a new team.time in the Timezone that I want. But this way ai is simpler and is native to GO. Thank you again.

-1

It is necessary to use the function time. Now(). In()

loc, _ := time.LoadLocation("America/Sao_Paulo")
// handle err
currentTime := time.Now().In(loc)

// outra forma de fazer o exemplo acima
loc, _ := time.LoadLocation("America/Sao_Paulo")
currentTime := time.Now()
currentTime.In(loc)

Example in Go Playground

  • This does not set a standard Timezone for all dates which is what I want. This will set a pattern for my current team variable.

-1

You can create a separate package by setting this configuration and importing it in the places you need, for example:

package tzinit

import (
    "os"
)

func init() {
    os.Setenv("TZ", "America/Sao_Paulo")
}

Importing configuration

main package

import _ "path_pacote/tzinit"

import (
    "fmt"
    "math"
    //mais algum outro pacote
)

I hope I’ve helped !

  • I had seen this answer on other topics and it just doesn’t work. I had already done some tests with it and it doesn’t work. If you want to test you can use the following code snippet: https://play.golang.org/p/-RnSNe2HVY2

-1

Straight arrow on the machine, then the team. Now() comes with the right Timezone.

Example of Dockerfile:

FROM alpine:latest
RUN apk add --no-cache tzdata
ENV TZ=America/Sao_Paulo
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
  • 2

    It is a good alternative, I could see to set these ENV by GO, because not everyone uses Docker, but is a great idea setar ENV. By the way, you tested to see if it works?

  • Setting this Timezone on the server machine has the same result if you don’t use Docker.

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