Create a symlink to file localtime:

# ln -sf /usr/share/zoneinfo/EST /etc/localtime

#date

[bash]# chkconfig –level 2345 ntpd on
[bash]# /etc/init.d/ntpd restart

[bash]# chkconfig –list ntpd

To see if the service started successfully, you should check the system log file.

[bash]# grep ntpd /var/log/messages

[bash]# ntpq -pn

For correct synchronization, the delay and offset values should be non-zero and the jitter value should be under 100.