NTP : Java Glossary

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NTP
NTP (Network Time Protocol) is an elaborate protocol that allows for setting the clock to 1 to 50 millisecond accuracy selecting from the best of several time sources. NTP 2 is covered in RFC 1305. NTP 3 is covered  RFC 1305. SNTP (Simple Network Time Protocol) is an adaptation of the NTP also used to synchronise computer clocks in the Internet. SNTP can be used when the ultimate performance of the full NTP implementation is not needed or justified. SNTP 3 is covered in RFC 3494. The standard Unix time service on UDP (User Datagram Protocol) socket/port 123 provides the UTC (Coordinated Universal Time/Temps Universel Coordonné) time of day as a 64-bit number with 32 bits as the integer and 32 bits as the fractional portion of seconds since 1900/01/01. The US Navy maintains a list of stratum 1 public NTP servers that Unix servers might use. Here is a list Stratum 2 public NTP servers that PC (Personal Computer) users would use.

pool.ntp.org maintains a set of servers all over the world. You can find one just by prefixing your 2-letter country code e.g ch.pool.ntp.org for Switzerland or ca.pool.ntp.org for

country codes
currency codes
List of Time Servers
NIST
NNTP
ntp.org
pool.ntp.org: pool scheme to assign a timeserver
SNTP
Stratum 2 public NTP servers that PC users could use
Stratum 2 public NTP servers that PC users could use
time sources
UK Stratum 2 timeservers
Windows Time
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