Time- and date-related bugs are pretty common within iOS and occur every year. “Do Not Disturb” feature in iOS 6, which allows users to select time periods during which they don’t want to receive calls and to limit calls, failed to work after New Year’s Eve and turned off itself instead of turning itself on as scheduled. Many unlucky iPhone, iPad, and iPod touch users missed calls or incoming notifications, or slept through their alarms.
Apple has now confirmed (via support article) that Do Not Disturb bug scheduling won’t be fixed until next week. It will begin working properly again only after January 7, 2013 on all iOS devices – iPad, iPod touch and iPad. Before this date, you should manually turn the Do Not Disturb feature on or off.
To do this, the users will have to “tap Settings > Notifications > Do Not Disturb and switch Scheduled to Off.”
Note: During the “do not disturb” period, calls go straight to voice mail and text messages are silent.