File size: 1,726 Bytes
04dc9f2 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | // Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build unix && !ios && !android
// Parse "zoneinfo" time zone file.
// This is a fairly standard file format used on OS X, Linux, BSD, Sun, and others.
// See tzfile(5), https://en.wikipedia.org/wiki/Zoneinfo,
// and ftp://munnari.oz.au/pub/oldtz/
package time
import (
"syscall"
)
// Many systems use /usr/share/zoneinfo, Solaris 2 has
// /usr/share/lib/zoneinfo, IRIX 6 has /usr/lib/locale/TZ,
// NixOS has /etc/zoneinfo.
var platformZoneSources = []string{
"/usr/share/zoneinfo/",
"/usr/share/lib/zoneinfo/",
"/usr/lib/locale/TZ/",
"/etc/zoneinfo",
}
func initLocal() {
// consult $TZ to find the time zone to use.
// no $TZ means use the system default /etc/localtime.
// $TZ="" means use UTC.
// $TZ="foo" or $TZ=":foo" if foo is an absolute path, then the file pointed
// by foo will be used to initialize timezone; otherwise, file
// /usr/share/zoneinfo/foo will be used.
tz, ok := syscall.Getenv("TZ")
switch {
case !ok:
z, err := loadLocation("localtime", []string{"/etc"})
if err == nil {
localLoc = *z
localLoc.name = "Local"
return
}
case tz != "":
if tz[0] == ':' {
tz = tz[1:]
}
if tz != "" && tz[0] == '/' {
if z, err := loadLocation(tz, []string{""}); err == nil {
localLoc = *z
if tz == "/etc/localtime" {
localLoc.name = "Local"
} else {
localLoc.name = tz
}
return
}
} else if tz != "" && tz != "UTC" {
if z, err := loadLocation(tz, platformZoneSources); err == nil {
localLoc = *z
return
}
}
}
// Fall back to UTC.
localLoc.name = "UTC"
}
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