time: unknown time zone "Europe/Kyiv"

[veqryn]

What version of Go are you using (go version)?

1.19.1

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

docker golang:1.19.1-bullseye

What did you do?

https://go.dev/play/p/3IiIaz4JUVV

package main

import (
	"fmt"
	"time"
)

func main() {
	location, err := time.LoadLocation("Europe/Kyiv")
	if err != nil {
		panic(err)
	}
	fmt.Println(location)
}

What did you expect to see?

No errors. Valid timezone.

What did you see instead?

unknown time zone Europe/Kyiv

Comments?

After you add Europe/Kyiv, please do not remove the old spelling (Europe/Kiev), as we have a lot of timezone locations saved as strings in our db and hope to be backwards compatible with them.

[hopehook]

cc @rsc

[hopehook]

In my local environment, Go 1.20 is ok. (Unpublished)

FYI: https://go-review.googlesource.com/c/go/+/422875

[seankhliao]

Time zone data is provided by the operating system, not Go itself.

[veqryn]

@seankhliao not true at all: https://github.com/golang/go/blob/4a4127bccc826ebb6079af3252bc6bfeaec187c4/lib/time/zoneinfo.zip

[hopehook]

@veqryn Does the latest timezone file solve your problem?

[veqryn]

@hopehook
I ran the Go Play link I provided above and selected "Go dev branch", which the url confirms is "tip", and I still get the following error:

panic: unknown time zone Europe/Kyiv

goroutine 1 [running]:
main.main()
	/tmp/sandbox1613371378/prog.go:11 +0x85

Program exited.

That said, looking at master, it does look like Kyiv was added recently. So I'm not sure why Go Play on Tip/Master is failing.
I'd also like this backported to 1.19.x please.

[hopehook]

I confirmed, the master branch solved your problem, the version of playground may not be up to date.
In addition, the latest timezone file was released after go1.19, this is not a bug of go1.19, so Backport does not seem to be feasible.

[hopehook]

also cc @dmitshur

[veqryn]

Feasible? It should be easy and have zero potential for disruption. It also would fix errors people are getting on the latest released version of Golang, even though it may not technically be a 'bug'.

[seankhliao]

the bundled tzdata needs to be explicitly imported
https://go.dev/play/p/RYhGsSU8Ads?v=gotip

[ZekeLu]

See also #38017:

Importing this package (as import _ "time/tzdata") will cause timezone information to be embedded in the program. Also, building with the build tag timetzdata will force the package to be imported, and therefore will cause timezone information to be embedded in the program. The embedded timezone information will be used if and when no system information is available for the timezone.

[arturyumaev]

_ "time/tzdata" solves my problem, thanks!