I stumbled upon an easy solution to clock skew or drift when, at least in my case, Redhat EL or Fedora 7 are a vmware server guest OS under Windows Server 2003.
Edit the /etc/grub.conf file and add to the end of the line that begins with "kernel /boot/vmlinuz-2.6.22.1-41.fc7.img ..."
These are the boot options for the kernel.
At the end of the above line add clock=pmtmr to the end of that line. Your kernel line in grub.conf should look similar to the following:
kernel /boot/vmlinuz-2.6.22.1-41.fc7 ro root=LABEL=/ rhgb quiet clock=pmtmr
Reboot and you clock drift should cease. Make sure to make a copy of the original just in case you cannot boot Linux. You can use either an alternate boot option or a rescue disk to recover to the original file.
