Bediuzzaman indicated that Hazrat Mahdi (as) will appear at hijri 1400

It now occurs to mind that if each of the letters "mim" and "lam" bearing the gemination mark are counted as two, THE PEOPLE WHO WILL DISSOLVE THE OPPRESSIONS A CENTURY LATER MAY BE THE DISCIPLES OF HAZRAT MAHDI (AS). (Bediuzzaman Said Nursi, Rays, The First Ray, p. 85)  

[They] suppose[d] a fact that would occur IN THE FUTURE OF THE WORLD ONE THOUSAND FOUR HUNDRED YEARS LATER to be close to their century. (Bediuzzaman Said Nursi, Words, Twenty-Fourth Word - Third Branch, Eight Principle)

The facts revealed in the address of Damascus that glance at the destiny of the Islamic world after the Hijri 1371... maybe not now but 30-40 years later, in order to fully equip science and, knowledge acquired through arts, science and skills, the goodness of civilization and those three forces, and to overcome the nine obstacles, He sent inclination for investigating the truth, moderation and love for human beings to the fronts of those nine foes. By Allah's Will, He will demolish them AFTER HALF A CENTURY. (Bediuzzaman Said Nursi, The Damascus Sermon, p. 25)  

IN [13]71, THE SUN BEGAN TO RISE (al-Fajr as-Sadiq) or will begin to rise. Even if this is only the initial redness in the horizon (al-Fajr al-Kazib), IN 30-40 YEARS AL-FAJR AS-SADIQ WILL APPEAR. (Bediuzzaman Said Nursi, The Damascus Sermon, p. 23)

1371 + 30 = 1401 = 1981
1371 + 40 = 1411 = 1991

It appears from this truth that; THIS BLESSED PERSON WHO WILL COME LATER WILL DISSEMINATE AND IMPLEMENT THE RISALE-I NUR AS A PROGRAM … (Bediuzzaman Said Nursi, The Ratifying Stamp of the Unseen, p. 9)

I believe I am A SERVANT OF THIS WONDROUS PERSON WHO WILL APPEAR IN THE FUTURE, A REAR-GUARD TO SET A BACKGROUND FOR HIM, and A PIONEERING SOLDIER OF THAT GREAT COMMANDER ... (Barla Addendum, p. 162)

IN THE BROAD SPHERE OF LIFE, ITS REAL OWNERS, IN OTHER WORDS HAZRAT MAHDI (AS) AND HIS FOLLOWERS, WILL COME WITH ALLAH’S LEAVE, WILL BROADEN THAT SPHERE, and THOSE SEEDS WILL FLOURISH. WE, ON THE OTHER HAND, SHALL WATCH FROM OUR TOMBS AND GIVE THANKS TO ALLAH. (Bediuzzaman Said Nursi, Kastamonu Addendum, p. 99)

It now occurs to mind that if each of the letters "mim" and "lam" bearing the gemination mark are counted as two, the people WHO WILL DISSOLVE THE OPPRESSIONS A CENTURY LATER MAY BE THE DISCIPLES OF HAZRAT MAHDI. (Bediuzzaman Said Nursi, Rays, First Ray, p. 85)   (Bediuzzaman wrote The First Ray in 1936)

There are such intellectual trends at that time that even IF THAT PERSON [HAZRAT MAHDI (AS)] WHO IS TRULY AWAITED AND WILL COME IN A CENTURY’S TIME comes at that time... (Bediuzzaman Said Nursi, Kastamonu Addendum, p. 57)

One hadith revealing that Hazrat Mahdi (as) will come in Hijri 1400 has come down from our Prophet (saas) as follows:

People will gather around Hazrat Mahdi (as) in the year 1400. (Risalat al-Khuruj al-Mahdi, p. 108)

Imam Rabbani reveals that Hazrat Mahdi (as) will appear “between the first and second millennium” following the death of our Prophet (saas):

It is expected that, AFTER 1000 YEARS, this secret administration will be renovated. It will be granted with superiority... This way, genuine virtue will emerge and cover the degradation... AND IT IS EXPECTED THAT HAZRAT MAHDI (AS), THE SUPPORTER, WILL COME. May Allah be pleased with him. (Imam Rabbani, Letters of Rabbani, vol. 1, p. 569)

The confirmation of the religious law, the renovation of people takes place IN THIS SECOND THOUSAND. The just witnesses of the truthfulness of this cause are THE EXISTENCE of the Prophet Jesus (as) and HAZRAT MAHDI (AS) IN THIS THOUSAND. (Imam Rabbani, Letters of Rabbani, vol. 1, p. 611)

Those among the nation of Allah's Messenger (saas) are highly perfected in faith. It does not matter whether they are few in number, even a thousand years passes after the death of the Messenger of Allah (saas). THE COMING OF HAZRAT MAHDI (AS) AFTER 1000 YEARS SERVES THIS PURPOSE. The Messenger of Allah (saas), the last Messenger, gave the glad tidings of his coming. Even the Prophet Jesus (as) will come down after 1000 years. (Imam Rabbani, Letters of Rabbani, vol. 1, p. 440)

A thousand years after the death of our Prophet (saas), people enter the second millennium. According to Imam Rabbani, quoted above, Hazrat Mahdi (as) and the Prophet Jesus (as) will come during the time between the first millennium and the second. He expresses it quite explicitly that Hazrat Mahdi (as) will come in the second millennium.

Hazrat Mahdi (as) is the Great Mujaddid of the End Times who will appear in Hijri 1400. In the same way that Allah has sent a mujaddid at the start of every Hijri century to revive Islamic moral values and virtues and rid the religion off innovations that have entered it subsequently, so He will definitely send a guide, a holy person, in Hijri 1400, as well. This person, who will cause Muslims to forget the troubles, pains and oppression they have suffered for hundreds of years and who will bring peace, happiness, justice, good governance, love and brotherhood to all mankind, is Hazrat Mahdi (as). However, in contrast to the mujaddids who have appeared in other centuries, Hazrat Mahdi (as) will be the Great Mahdi of the End Times and will intellectually destroy all systems based on oppression and false beliefs and philosophies at a time when the system of the antichrist is at its most depraved.