Run the date command to make sure you have the correct time:
[root@server /root]# date Thu Sep 20 11:00:06 CDT 2001 [root@server /root]#
If your timezone is correct but the date and/or time needs updating, the following commands will update the date and time. The second command is needed in order to push the date and time into the PC clock.
[root@server /root]# date 092011082001 Thu Sep 20 11:08:00 CDT 2001 [root@server /root]# hwclock --utc --systohc [root@server /root]#