The NTP Protocol (Network Time Protocol) can be used to keep our system clock synchronized with several time server available in the Internet.
Use the network time server to keep system clock accuracy.
root@server:~# aptitude install ntpdate ntp-doc
Firstly, check the Timezone configuration.
Then synchronize system clock with on of the several timeservers from the ntp.org pool:
root@server:~# ntpdate -u pool.ntp.org 6 May 18:41:56 ntpdate: adjust time server 22.214.171.124 offset 0.022801 sec