从授时服务器获取时间的函数[GetNetWorkTime()]

func GetNetWorkTime() (time.Time, error) { var host string flag.StringVar(&host, "e", "182.92.12.11:123", "NTP host")//这里可以更改182.92.12.11为任何授时服务器 flag.Parse()

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conn, err := net.Dial("udp", host)
if err != nil {
	return time.Time{}, err
}
defer func(conn net.Conn) {
	err := conn.Close()
	if err != nil {

	}
}(conn)
if err := conn.SetDeadline(time.Now().Add(15 * time.Second)); err != nil {
	return time.Time{}, err
}

req := &packet{Settings: 0x1B}

if err := binary.Write(conn, binary.BigEndian, req); err != nil {
	return time.Time{}, err
}

rsp := &packet{}
if err := binary.Read(conn, binary.BigEndian, rsp); err != nil {
	return time.Time{}, err
}

secs := float64(rsp.TxTimeSec) - ntpEpochOffset
nanos := (int64(rsp.TxTimeFrac) * 1e9) >> 32

showtime := time.Unix(int64(secs), nanos)
return showtime, err

}