John D. Sutter, CNN:
A glitch in the iPhone’s operating system will cause recurring
weekday alarms not to ring on time on Monday morning because of
the end of Daylight Saving Time, which occurs at 2 a.m. on Sunday
in the United States. The phone’s alarm app doesn’t recognize the
time change and will ring an hour late if users don’t go into the
program and manually reset the alarms.
Users who depend on the iPhone to wake them up should create
one-time alarms specifically for Monday morning, said Apple
spokeswoman Natalie Harrison.