Setting the timezone and correcting the time on a RHEL server. Example uses MTD timezone.

correcting_clock.sh

# Set the timezone in the system configuration.
sudo vim /etc/sysconfig/clock
# Symlink the correct timezone (in this case MDT) into /etc/localtime
sudo ln -sf /usr/share/zoneinfo/America/Denver /etc/localtime
# Correct the date/time using ntpdate.
sudo ntpdate 0.north-america.pool.ntp.org
# Make sure ntpd is running.
sudo service ntpd restart
# Configure ntpd to run at boot-up.
sudo chkconfig ntpd on
# Set the hardware clock to the corrected system clock.
sudo hwclock -w

# To check your system clock:
date
# To check your hardware clock:
sudo hwclock --show