To keep your Linux up to date with your local time, you should use ntpd(Network Time Protocol deamon):
1- first specify your timezone to your system(dig /usr/share/zoneinfo to find your own):
ln -s /usr/share/zoneinfo/Europe/Paris /etc/localtime
2 - Install Network Time Protocol daemon:
apt-get install ntp
3 - Sync time(Give it a public time server):
sudo service ntp stop sudo ntpdate -s 0.fr.pool.ntp.org sudo service ntp start
That's it.
Sheda