Fix loading timezone info on windows (#32029)

* Fix loading timezone info on windows

* Move setting zoneinfo to config load

* Construct proper file path

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>

pkg/setting/setting.go

@@ -12,6 +12,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"runtime"
 	"strconv"
 	"strings"
 	"time"
@@ -48,6 +49,9 @@ const (
 	authProxySyncTTL = 60
 )
 
+// zoneInfo names environment variable for setting the path to look for the timezone database in go
+const zoneInfo = "ZONEINFO"
+
 var (
 	// App settings.
 	Env              = Dev
@@ -757,6 +761,14 @@ func (cfg *Cfg) validateStaticRootPath() error {
 func (cfg *Cfg) Load(args *CommandLineArgs) error {
 	setHomePath(args)
 
+	// Fix for missing IANA db on Windows
+	_, zoneInfoSet := os.LookupEnv(zoneInfo)
+	if runtime.GOOS == "windows" && !zoneInfoSet {
+		if err := os.Setenv(zoneInfo, filepath.Join(HomePath, "tools", "zoneinfo.zip")); err != nil {
+			cfg.Logger.Error("Can't set ZONEINFO environment variable", "err", err)
+		}
+	}
+
 	iniFile, err := cfg.loadConfiguration(args)
 	if err != nil {
 		return err