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 aix darwin,!ios dragonfly freebsd linux,!android 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), https://en.wikipedia.org/wiki/Zoneinfo, and ftp://munnari.oz.au/pub/oldtz/

package time

import (
	
	
)
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",
}
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.

	,  := syscall.Getenv("TZ")
	switch {
	case !:
		,  := loadLocation("localtime", []string{"/etc"})
		if  == nil {
			localLoc = *
			localLoc.name = "Local"
			return
		}
	case  != "":
		if [0] == ':' {
			 = [1:]
		}
		if  != "" && [0] == '/' {
			if ,  := loadLocation(, []string{""});  == nil {
				localLoc = *
				if  == "/etc/localtime" {
					localLoc.name = "Local"
				} else {
					localLoc.name = 
				}
				return
			}
		} else if  != "" &&  != "UTC" {
			if ,  := loadLocation(, zoneSources);  == nil {
				localLoc = *
				return
			}
		}
	}
Fall back to UTC.
	localLoc.name = "UTC"