NTP is a TCP/IP protocol for synchronizing time over a network. Basically a client requests the current time from a server, and uses it to set its own clock. This may lead to inconsistent logs if the clock is very inaccurate within 24 hours (should not be so), in that case investigate ntpd which is an improvement.
$ ls -l /etc/cron.daily/ntpdate
-rwxr-xr-x 1 root root 23 2014-11-04 14:02 /etc/cron.daily/ntpdate
$ cat /etc/cron.daily/ntpdate
ntpdate ntp.ubuntu.com
$ sudo chmod 755 /etc/cron.daily/ntpdate
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