If you use alarms on your iPhone, there may be a problem when we re-set the clocks back 1 hour on Nov 7. I suspect that Hawaii users, who do not change their times, will not be affected by this bug
An iPhone bug already seen when Australia switched between Daylight Savings Time and Standard Time a few weeks ago has now hit Europe. Twitter just lit up with reports of recurring iPhone alarms going off an hour later than usual. So even though the iOS clock changed correctly over the weekend, the alarm did not.