| // 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. |
| |
| // +build darwin,386 darwin,amd64 dragonfly freebsd js,wasm linux,!android nacl netbsd openbsd solaris |
| |
| // Parse "zoneinfo" time zone file. |
| // This is a fairly standard file format used on OS X, Linux, BSD, Sun, and others. |
| // See tzfile(5), http://en.wikipedia.org/wiki/Zoneinfo, |
| // and ftp://munnari.oz.au/pub/oldtz/ |
| |
| package time |
| |
| import ( |
| "runtime" |
| "syscall" |
| ) |
| |
| // Many systems use /usr/share/zoneinfo, Solaris 2 has |
| // /usr/share/lib/zoneinfo, IRIX 6 has /usr/lib/locale/TZ. |
| var zoneSources = []string{ |
| "/usr/share/zoneinfo/", |
| "/usr/share/lib/zoneinfo/", |
| "/usr/lib/locale/TZ/", |
| runtime.GOROOT() + "/lib/time/zoneinfo.zip", |
| } |
| |
| 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" means use /usr/share/zoneinfo/foo. |
| |
| 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 != "" && tz != "UTC": |
| if z, err := loadLocation(tz, zoneSources); err == nil { |
| localLoc = *z |
| return |
| } |
| } |
| |
| // Fall back to UTC. |
| localLoc.name = "UTC" |
| } |