I really do not think the "end of the world" will be religion based. Of course, people will say "but God knows, and plans what will happen," so it all comes down to your beliefs/faith.

I don't really know how this world will end. If our technology keeps getting better at such a fast pace, I don't see what kid end it. Normally, I would say something like an astray asteroid or the ozone layer gets screwed over, but it all depends on how fast this world keeps moving and discovering things, unless sometimes happens with the sun, in which we would all die really fast.

So, of course there is no answer, and it is impossible to pick a single date.

Only time will tell.