The time as to when this will happen is known only to God.  God says in the Quran:

“They ask you about the (final) Hour - when will be its appointed time? Say: ‘The knowledge thereof is with my Lord (alone): none but He can reveal as to when it will occur. Heavy were its burden through the heavens and the earth. Only, all of a sudden will it come to you.’ They ask you as if you were eager in search thereof: say: ‘the knowledge thereof is with God (alone), but mostly men know not.” (Quran 7:187)

To get the whole picture read my book WHAT HAPPENS AFTER WE DIE?