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Not forgetting Sunday morning's time change is hard enough.

But Apple iPhone users in the United States must also remember to delete and then reset their phone's alarm clock -- otherwise they may be an hour late for work on Monday morning.

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.

"We suggest customers set nonrepeating alarms for now and reset after November 7 to resolve the issue," she told CNN.

Later this month, Apple will release an updated version of its mobile software, iOS 4.2, which will permanently fix the problem, Harrison said.

This news comes after iPhone users in Australia and Europe reported problems with their alarms ringing late after time changes on those continents earlier this year.

CNN has the details HERE!