To resolve this behavior for existing alarms, Apple recommends users set the repeat interval to Never. Users will also need to reset these alarms for each day you need them. After November 7, 2010, the document says, you’re able to set your alarms to repeat again.
Apple adds the support document will be updated as more information becomes available.
This isn’t the first time that the switch has caused problems for iPhone users. At the end of September and the beginning of October, the change
caused alarms in New Zealand and Australia to go off one hour early.
Apple devices affected by the bug are the second-, third- and fourth-generation iPod touch, iPhone 3G, iPhone 4, and iPhone 3GS.