If you schedule your iOS Do Not Disturb feature to turn off at a certain timing, you might nothing that it isn’t working anymore after 1 January 2013.
According to Apple, the Do Not Disturb scheduling feature will resume normal functionality after 7 January 2013. For now, you should manually turn the Do Not Disturb feature on or off. Apple won’t be releasing any fix for this.
I have no idea how did this feature break down. 2013 is not a special year like year 2000. It’s just weird. And this is not the first time iOS devices having issue after 1 January. If you recall, iPhone had an alarm glitch on the first 2 days of 2011. Luckily for me, I don’t use the Do Not Disturb scheduling feature. In fact, I don’t even use the Do Not Disturb feature. I usually just silence my phone when I need to have some peace.
You might want to take note of this bug if you are using the Do Not Disturb scheduling feature.