sntp - 1:4.2.8p12+dfsg-4 main

NTP, the Network Time Protocol, is used to keep computer clocks
accurate by synchronizing them over the Internet or a local network,
or by following an accurate hardware receiver that interprets GPS,
DCF-77, NIST or similar time signals.
.
sntp can be used as an SNTP client to query a NTP or SNTP server and
either display the time or set the local system's time. It is not
sufficient, however, for maintaining an accurate clock in the long run.