The Dajjal is one of the major signs of the day of judgement. There is the major and the minor signs. All the minor signs will happen before the major signs. Here are some minor signs many of which has happened. These are shortened versions which come from hadiths.
-The coming of the last Prophet, Mohammad (SAW). This has already happened ofcourse
-The slave will become the master.
-The disappearance of knowledge and the appearance of ignorance. The leaders of the Muslims will be chosen from ignorant people, and they will rule according to their whims.
-Adultery and fornication will be prevalent. (The Prophet (s.a.w) said that this has never happened without new diseases befalling the people, which their ancestors had not known.)
-Adultery and fornication will be performed in the open.
-The consumption of intoxicants will be widespread.
-Women will outnumber men......eventually 50 women to 1 man.
-Killing, killing, killing. Killing will increase.
-The children will be filled with rage.
-Rain will be acidic or burning
-Children of fornication will become widespread or prevalent.
-When a trust becomes a means of making a profit.
-Gains will be shared out only among the rich, with no benefit to the poor.
-When a man obeys his wife and disobeys his mother; and treats his friend kindly while shunning his father.
-People will walk in the marketplace with their thighs exposed.
-Great distances will be traversed in short spans of time.
-People will hop between the clouds and the earth. (airplanes?)
-The leader of a people will be the worst of them.
-Time will pass rapidly.
-People will be carrying on with their trade, but there will only be a few trustworthy persons.
-A man will pass by a grave and wish that he were in their place.
-Earthquakes will increase
-Women will be naked in spite of being dressed.
-The conquest of Constantinople by the Muslims. This has happened and has been renamed Istanbul.
-When the shepherds of black camels start boasting and begin to compete with others in the construction of taller buildings(Dubai?)
-Wild animals will be able to talk to humans.
-A man will leave his home and his thigh or hip will tell him what is happening back at his home.(cellphones?)
-When men sleep with men and women sleep with women.
-Books will be widespread and knowledge will be low.
-Arrogance will increase in the earth.
-Men will begin to look like women and women will begin to look like men.
The major signs
-Al-Dajjal. (The Anti-Christ) He will come claiming to be god holding Heaven and Hell. His purpose is to deceive, and unbelievers will follow him. He is short, red-faced, blind in the right eye, and has hair that sticks up. He will go around the world but will be unable to enter Madinah or Makkah.
-Al-Mahdi. He will come at the time of the Dajjal. He will call to the true Islam, and will be a military leader. His name will be exactly like that of the Prophet Mohammad (SAW), and his father's name will match the Prophet's father's name also.
-The appearance of Masih al-'Isa (Jesus Christ), the son of Mary. (peace be upon him). He will come at the time of the Dajjal and the Mahdi also. He will descend at the time of Fajr prayer on a masjid in Damascus, the capital of Syria. He is of medium height, red-faced, and his hair is as if he just took a shower. He will call people back to Islam, but he will also be a military leader. The people of the Book will revert to Islam, and wealth will be super-abundant. Isa will break the cross, kill the swine, and personally slay the Dajjal. He will stay on Earth for a long time thereafter, and then die.
-Ya'juj and Ma'juj. (Gog and Magog) Two hidden tribes of people will break free of the dam that hold them back, and ravage the Earth. They will drink all the water, and kill people until Allah sends against them a worm which will wipe them out.
-The destruction of the Ka'bah and the recovery of its treasure.
-Three major landslides (one in the East, one in the West, and one on the Arabian peninsula).
-The rising of the sun from the west.
-The smoke. The smoke will appear all over the Earth which will cause all believers to catch something similar to a slight cold, whereas the unbelievers will be hit harder by it.
-The wind will take the souls of the believers.
-The fire will drive the people to their final gathering place Three blasts of the trumpet (fear & terror, death, resurrection).