missing Location in call to Time.In

Question

When I ues beego/orm to operate postgresql database,there is an error like this "missing Location in call to Time.In".

code example

type dataTest struct {
    Id      int         `pk:"auto"`
    Data    time.Time   `orm:"auto_now;type(timestamp);null"`
}

local, _ := time.LoadLocation("UTC")
test_time, err := time.ParseInLocation("2006-01-02 15:04:05", "1111-01-25 14:27:07", local)
orm.DefaultTimeLoc = time.UTC

o,err := orm.NewOrmWithDB("postgres","default",db)
temp := new(dataTest)
temp.Id = 1
temp.Data = test_time
o.Update(temp)

Answer 1

For docker (build multi stage)

Install tzdata after build

RUN apk --no-cache add tzdata

List of time zones available, see: https://golang.org/src/time/zoneinfo_abbrs_windows.go

loc, _ := time.LoadLocation("America/Bogota")
now := time.Now().In(loc)

Answer 2

Problem

OS: Windows.

When I distribute the executable file to other computers, they encounter the following problem when running it.

time: missing Location in call to Time.In

However, there are no issues when debugging the code on my own computer.

Later, I discovered that the problem was caused by the time.LoadLocation function, which references runtime.GOROOT/lib/time/zoneinfo/zoneinfo.zip^{gorootZoneSource(runtime.GOROOT()) gorootZoneSource}. Therefore, if the runtime.GOROOT on other computers is different from that of the developer or even nonexistent, it will cause problems.

Solution

Unzip %GOROOT%/lib/time/zoneinfo/zoneinfo.zip, select the desired time zone file, and use embed together with time.LoadLocationFromTZData to obtain the data for that region.

Example

package main

import (
    "embed"
    "time"
)

//go:embed zoneInfo
var zoneInfoFS embed.FS // get it from GOROOT/lib/time/zoneInfo.zip

func getLocation(name string) (loc *time.Location) {
    bs, err := zoneInfoFS.ReadFile("zoneInfo/" + name)
    if err != nil {
        panic(err)
    }
    loc, err = time.LoadLocationFromTZData(name, bs)
    if err != nil {
        panic(err)
    }
    return loc
}

func main() {
    locTW := getLocation("Asia/Taipei")
    locJPN := getLocation("Asia/Tokyo")
}

Directory Structure

-📜main.go
- 📂zoneInfo
  - 📂Asia
      - 📜Taipei
      - 📜Tokyo
  - ...

Answer 3

This should work:

type dataTest struct {
    Id      int         `pk:"auto"`
    Data    time.Time   `orm:"auto_now;type(timestamp);null"`
}

test_time, err := time.ParseInLocation("2006-01-02 15:04:05", "1111-01-25 14:27:07", time.UTC)
orm.DefaultTimeLoc = time.UTC

o,err := orm.NewOrmWithDB("postgres","default",db)
temp := new(dataTest)
temp.Id = 1
temp.Data = test_time
o.Update(temp)

Answer 4

Since Go 1.15 (released 2020-08-11) you can embed time zone info into your program. This allow not to rely on tzdata provided by OS.

import _ "time/tzdata"

See https://go.dev/doc/go1.15#time_tzdata