I remember that there was a software update from Apple (I don't remember which OS but it might have been 10.3) that specifically addressed this clock issue. Apple released it after the days for switching from Daylight Time to Standard Time (and vice versa) were changed.
Apple and other OS manufacturers have to release an update every time our schizophrenic government changes their mind as to the daylight savings time schedule.
Unfortunately, older OSs that don't receive updates don't get them, and then you get numerous labs of older computers whose clocks fall back a week early, then you reset them all, then a week later you have to manually fall them back. fun.