What's so special about this date?
https://www.wolframalpha.com/input/?i=2017-12-02+00:15+to+un...
==> 1512170100
That's not it. (Not like the KMail crash on 2001-09-09. :-)
https://www.wolframalpha.com/input/?i=2017-12-02+00:15+to+un...
==> 1512170100
That's not it. (Not like the KMail crash on 2001-09-09. :-)
Basically, you can do notifications up to 30 days ahead, 2nd December + 30 days = 1st January, something overflows and thinks month(January) = Month(December)+1 instead of correctly looping around.