Hobbit itself doesn't really have anything that is time-specific. As long as the OS is patched, logging should be correct. The only thing I'm not sure about is if RRD needs any patching; I would imagine it is the same thing, as long as the OS is patched.
I didn't find any question asked about 2007 DST readiness for Hobbit on the list. Should it be assumed it won't be problem at all? For one thing, the scheduled downtime and such would be specific to local time. Assume the underlying operating system has been patched and is ready to accomodate 2007 DST changes in North America.