Class NtpClient


  • public class NtpClient
    extends Object
    NtpClient - an NTP client for Java. This program connects to an NTP server and prints the response to the console. The local clock offset calculation is implemented according to the SNTP algorithm specified in RFC 2030. Note that on windows platforms, the curent time-of-day timestamp is limited to an resolution of 10ms and adversely affects the accuracy of the results. Public only for main(), not a public API, not for external use. 2036-compliant as of 0.9.50, see NtpMessage.
    Since:
    0.9.1 moved from net.i2p.time
    Author:
    Adam Buckley (minor refactoring by jrandom)
    • Field Detail

      • SECONDS_1900_TO_EPOCH

        static final double SECONDS_1900_TO_EPOCH
        difference between the unix epoch and jan 1 1900 (NTP uses that)
        See Also:
        Constant Field Values
    • Constructor Detail

      • NtpClient

        public NtpClient()
    • Method Detail

      • currentTimeAndStratum

        static long[] currentTimeAndStratum​(String[] serverNames,
                                            int perServerTimeout,
                                            boolean preferIPv6,
                                            Log log)
        Query the ntp servers, returning the current time from first one we find Hack to return time and stratum
        Parameters:
        log - may be null
        Returns:
        time in rv[0] and stratum in rv[1]
        Throws:
        IllegalArgumentException - if none of the servers are reachable
        Since:
        0.7.12
      • main

        public static void main​(String[] args)
                         throws IOException
        Usage: NtpClient [-6] [servers...] default pool.ntp.org
        Throws:
        IOException