Go应用在容器中的时区

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"
}