Failure is either subjective, or it could be the start of a huge change. We really wont know until after the 21st passes and several months go by.

But also, the calendar has been changed and it may not align perfectly with the actual Gregorian date they claim.

Another thing is I believe they got much of their knowledge from an entity not known for telling the truth. So, was the calendar they used actually the one we think it was, or did the entity give it to them, and lie about the end time event, we again wont know for some time. But hey, there is still several hours left today, and who knows what may happen before the calendar changes to the 22nd.

But the world of course wont end today, that I never believed.