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Allah will bring out from concealment al-Mahdi from my family and just before the day of Judgment; even if only one day were to remain in the life of the world, and he will spread on this earth justice and equity and will eradicate tyranny and oppression.
(Musnad Ahmad Ibn Hanbal, Vol. 1, P. 99)

The promised Mahdi will be among my family. God will make the provisions for his emergence within a single night.
(Ibn Majah, Sahih, Vol. 2, P. 519)

Our Mahdi will have a broad forehead and a pointed (prominent) nose. He will fill the earth with justice as it is filled with injustice and tyranny. He will rule for seven years.
(Abu Dawud, Sahih, Vol. 2, p. 208; Fusul al-muhimma, p. 275)

After the death of a Ruler there will be some dispute between the people. At that time a citizen of Madina will flee (from Madina) and go to Makkah. While in Makkah, certain people will approach him between Hajrul Aswad and Maqaame Ibraheem, and forcefully pledge their allegiance to him. Thereafter a huge army will proceed from Syria to attack him but when they will be at Baida, which is between Makkah and Madina, they will be swallowed into the ground. On seeing this, the Abdaals of Shaam as well as large numbers of people from Iraq will come to him and pledge their allegiance to him. Then a person from the Quraish, whose uncle will be from the Bani Kalb tribe will send an army to attack him, only to be overpowered, by the will of Allah. This (defeated) army will be that of the Bani Kalb. Unfortunate indeed is he who does not receive a share from the booty of the Kalb. This person (Imam Mahdi) will distribute the spoils of war after the battle. He will lead the people according to the Sunnat and during his reign Islam will spread throughout the world. He will remain till seven years (since his emergence). He will pass away and the Muslims will perform his Janazah salaat.
(Abu Dawood)

For our Mahdi, there are two signs. Since the birth of Universe, these events have never taken place. Those two signs are that there will be Lunar Eclipse on the first night of Ramadhan and Solar Eclipse in the middle of Ramadhan.

(Dar-e-Qatni, Vol. 1, P.188)

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For our Mahdi, there are two signs. Since the birth of Universe, these events have never taken place. Those two signs are that there will be Lunar Eclipse on the first night of Ramadhan and Solar Eclipse in the middle of Ramadhan.

OK astronomy buffs. We should be able to calculate when this will occur. When is it?

He will fill the earth with justice as it is filled with injustice and tyranny. He will rule for seven years.
(Abu Dawud, Sahih, Vol. 2, p. 208; Fusul al-muhimma, p. 275)

Hmmmm. Sound familiar? Anyone?

Hint: Substitute 'peace' for 'justice'.

Our Mahdi will have a broad forehead and a pointed (prominent) nose. He will fill the earth with justice as it is filled with injustice and tyranny. He will rule for seven years. (Abu Dawud, Sahih, Vol. 2, p. 208; Fusul al-muhimma, p. 275)

Our Bible says the Anti-Christ will rule for 7 years, and Christ will come to destroy him.