This morning my iphone alarm for the first time went off an hour early.  Pissed, I reset it in the clock app for the right time, thinking it was a one-off strange event, but nope, it didn’t go off at the right time at all and I slept in a couple hours more than I intended.

Some sleuthing online proved it to be an ios 4 bug that lots of new zealanders started having trouble with almost a month ago.

The facts: 

1. Daylight saving (called saving, not savings) time starts in the US a week from now, Nov. 7.  [http://www.timeanddate.com/time/dst/events.html]
2. ios 4 has a bug that screws this up somehow in the alarm of the clock app.

Solutions

1. Remove all repeats from the alarm and that seems to fix it.  Worked for me.  You’ll just have to set and double-check your alarm every night. [http://www.macworld.com.au/help/fixing-ios-4s-wonky-daylight-saving-alarms-17387/]  
2. Alternative: Download “Alarm Clock Free” from the app store.  Limitation: You’ve got to leave that app running when you close your phone at night.