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Whenever the system clocks time changes the timers used by RV will be affected. If the clock time is moved forward then many timers may go off at once such as heartbeat, activation times and messages held for 60 second reliability, just to note the more noticeable ones.  

If the time is set back then you may have timers delayed by the time move back. So if time is set back there may be heartbeat delayed, activations on other systems due to lack of heartbeats and the daemon keeping up to an additional 60 seconds worth of messages which increases the memory used by the daemon.

If a system clock is regularly jumping in time it should be addressed.  On some systems where system clocks are drifting a little higher than usual more frequent system time syncs have reduced the jumps on a system time.  By reducing the time jumps to smaller than the heartbeat time, you can avoid most false activations.