More articles:

http://www.silverdoctors.com/gold/gold-news/does-this-seven-year-cycle-of-economic-crashes-predict-the-exact-date-of-the-global-financial-collapse/
http://theeconomiccollapseblog.com/archives/shemitah-biblical-pattern-indicates-financial-collapse-may-coming-2015

A lot of people have written about it. It's based on the idea that market failures coincide with the Jewish Jubilee and that there is a super Jubilee that happens once every fifty years in which the effect is stronger.

The stronger ones usually coincide with Israel taking a military action.

Apparently, October is the expected time.