Shouldn't the challenge end at 11:59 PM Monday Week 15 Day2? That would be 14 full weeks X 7 days per week = 98 days + 2 more days in Week 15 = 100 days.
Well, maybe. But, there's no sense in bringing that up now. Just end the challenge at the exact time as listed in the rules and all is fine. 
True, but it is something that I think should be set in stone for future 100 day challenges, because technically if you end it at the start of the 100th day, it isn't a 100 day challenge, but a 99 day challenge. But I'm not trying to start an argument, just pointing something out. You make the rules Metro, and we obviously have to follow them

I think the nectar aging up at exactly midnight also had something to do with the ending time of the challenge.
Good point, but again, for future challenges, it could be debatable.