Why KVM guest clocks jump forward one hour on reboot?

Solution Unverified - Updated -

Issue

An RHEL 5.6 guest is installed on RHEL5.6 KVM host. When the guest is first started up, it has the correct time. When it's rebooted (using "shutdown -r now" or "reboot" command), its time jumps forward one hour.

If it's rebooted again, the time does not change again, but it is one hour ahead of the host.

If it's destroyed and restarted it comes up with the same time as the host. The time will jump forward one hour if the guest is rebooted after that.

This happens only if DST is in active.

Environment

Red Hat Enterprise Linux 5.6 as KVM host.

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