Don't know a date, but keep watching Israel/Syria. TSHTF for the whole world when Israel gets heavy damage, Damascus and Israel's neighbors get destroyed and Russia then swoops in to take advantage of a weak Israel.

That's when Jesus steps back on the world scene and destroys Russia (Psm.110,Ezek.38), destroys Babylon(U.S.A.)Jer.50-51, Raptures Believers at the opening of the 6th seal(Isa.46?,Isa.13 don't have a bible in front of me)