The date I believe on is March 22 being the date it all begins. That date is what is extremely well documented, and thoroughly evidenced. Some put forward the Feast of Trumpets as being on Sep 1 2016; others as Oct 3 2016. I believe it is around Sept 1, but I've heard very convincing arguments for October. I am NOT an expert on the Hebrew calendar, so I leave that to others with more expertise.
What is critically important at this time is the event that will happen first to trigger the Tribulation Timeline, and change the whole world. As I believe in the rapture, I believe what happens after that date is not to be focused on so much as this time. Those that are in the tribulation will, no doubt, be able to discern the rest of the timeline; I believe God will make sure they know so they will have all the more hope for the return of Christ to save them.
If I had to say for certain, I would pick Sep or Oct 2016, but I can not say for certain which one at this point.
Come Lord Jesus
Marantha