Yes, this was a tricky one to get around. The basic case is that if you set the start date to 2014-01-12 13:00, then in 'day' view the 12th would not be clickable as the date it compared was 2014-01-12 00:00, which is out of bounds so I couldn't drill down to click on the start time from any less specific views. Or also January 2014 would be set as out of bounds in the above example.