Every... ****ing... Year...
My thought EXACTLY. How do they have an issue with something every single year??? Has no one at Apple ever dealt with a January 1st date on their equpiment.
This actually doesn't surprise me. I've started looking forward to a new mishap every year. Calendars, iCal, Clocks, scheduled events, etc. it has to be something.
If something doesn't happen to an Apple device on January 1st, my day isn't quite right. I've come to accept it. As absurd as it is, it's just become the new normal.
I turned it off (and back on) in my Notifications section, but turning it off the Do Not Disturb switch in Settings didn't do anything. Looks ok now, I guess. No need to reboot; just toggle.