Set your correct timezone:
* You may need to install timeconfig 'yum install tzdata'
select your timezone.. select "system clock uses UTC"
or you can set it manually
ln -sf /usr/share/zoneinfo/America/Los_Angeles /etc/localtime
Set the correct system clock
# ntpdate pool.ntp.org
to set the system time manually to 2:30pm:
date -s "14:30:00"
It's recommended to keep your hardware clock set to UTC/GMT. This maintains clocks without having to worry about daylight savings time.
To set hardware clock from system clock and to UTC/GMT
# hwclock --systohc --utc
# hwclock --show
You may also want to check this post: