The community of Hazrat Mahdi (pbuh) continues until Hijri 1506 (2082-2083 ). After Hijri 1506, the form of preaching the message of religion, their system changes completely. I mean after that date, Muslims would only be able to communicate with each other with very secret, hidden symbols, because they will kill all Muslims. The Qur'an will be burned and there will be nothing left pertaining to acts of worship. They will burn down the mosques, they will demolish the Kaba'a and only the plain field of the Kaba'a will remain. They will not leave behind anything pertaining to what is holy. - Harun Yahya