Why September 13, 2015? Why that particular date? Just curious...
I haven’t checked exactly, but 9/11/2001 and the meltdown in 2008 were exactly 7 years apart, according to the calendar Rabbi Kahn uses. So, 9/13/2015 is the next date of 7 in the series, with a given that people have not repented and turned again to God-and so have their fate to look forward to.
I watched a few videos on YouTube of Kahn about this. He makes a case. Worth looking at. Not terribly long, but have strong drink and hair dye on tap.