Re: Timeline of Nolan's trilogy.
Many dates contradict each other. I think there's no set time frame to be honest. It's almost like LOST, most questions were answered by the finale but there's still a few more that they never answered and kept vague. You could draw up your own conclusions. It's kind of the same vibe here.
The timeline stuff, where Bruce/Selinas lives go from here, what Blake becomes, where Gotham is headed...some things are left open and that's that.
For every fan who thinks there was 6 months to a year between BB/TDK, there's another who will think Batman was active for a few years. The dates are all over the place as far as im concerned, so it doesn't really matter.