The Network Time Protocol (NTP) is used to synchronize clocks of computer and network system. NTP uses UDP port 123 to communicate.
For network management and purposes and troubleshooting is it important that the clock of every device is synchronized. The timestamps of logging and debugging output are synchronized.
To synchronize the clock of a Cisco router you have to configure the router as a NTP client.
Down here an example of a NTP configuration:
ntp server [ntp server]
ntp source [source-interface]
Besides NTP is the time zone and DST (summertime) can be set:
clock timezone UTC 1
clock summer-time MET recurring last Sun Mar 2:00 last Sun Oct 3:00
See How to configure time zone and summertime for more details.
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