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Ntpdate not updating clock

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Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. NTP is intended to synchronize all participating computers to within a few milliseconds of Coordinated Universal Time (UTC).

In operation since before 1985, NTP is one of the oldest Internet protocols in current use. It uses the intersection algorithm, a modified version of Marzullo's algorithm, to select accurate time servers and is designed to mitigate the effects of variable network latency.

NTP can usually maintain time to within tens of milliseconds over the public Internet, and can achieve better than one millisecond accuracy in local area networks under ideal conditions.

Asymmetric routes and network congestion can cause errors of 100 ms or more.

These are computers whose system clocks are synchronized to within a few microseconds of their attached stratum 0 devices.

Stratum 1 servers may peer with other stratum 1 servers for sanity checking and backup.

The current NTPv4 format has support for Era Number and Era Offset, that when used properly should aid fixing date rollover issues.

According to Mills, "the 64 bit value for the fraction is enough to resolve the amount of time it takes a photon to pass an electron at the speed of light.

Despite the relatively slow computers and networks available at the time, accuracy of better than 100 milliseconds was usually obtained on Atlantic spanning links, with accuracy of tens of milliseconds on Ethernet networks.They employ the same algorithms for peering and data sampling as stratum 2, and can themselves act as servers for stratum 4 computers, and so on.The upper limit for stratum is 15; stratum 16 is used to indicate that a device is unsynchronized.They generate a very accurate pulse per second signal that triggers an interrupt and timestamp on a connected computer.Stratum 0 devices are also known as reference clocks.In 1991, the NTPv1 architecture, protocol and algorithms were brought to the attention of a wider engineering community with the publication of an article by David L. In 1989, RFC 1119 was published defining NTPv2 by means of a state machine, with pseudocode to describe its operation.