Clock management on Linux

[ Thanks to linuxaria for this link.

“The Network Time Protocol (NTP) is a protocol for synchronizing
the clocks of computer systems over packet-switched,
variable-latency data networks.

“NTP provides Coordinated Universal Time (UTC). No information
about time zones or daylight saving time is transmitted; this
information is outside its scope and must be obtained separately.
In isolated LANs, NTP could in principle be used to distribute a
different time scale (e.g. local zone time), but this is uncommon

“ntpdate is a computer program used to synchronize and set
computers’ date and time by polling the Network Time Protocol (NTP)