Though Allah only knows when the Last Hour before the Day of Resurrection will come, He has given us 'clues' about its approach through information in the Qur'an and the hadith of the Prophet.This article does not cover all the signs, but most of the important ones are here. All these signs are, of course, based on hadith and/or Qur'an, mainly the former.
The signs are divided into PAST,PRESENT and FUTURE
Past
1. Splitting of the Moon.
2. Death of the Prophet Muhammad, may Allah bless him and grant him peace.
3. A form of death which will kill thousands of Muslims. (Understood to refer to the plague of Amwas during the caliphate of ‘Umar ibn al-Khattab.)
4. A major fighting in Madinah (understood to refer to the battle of al-Harrah during the caliphate of Yazid, 63 AH).
5. The Muslim conquest of Jerusalem.
6. The Muslim conquest of Constantinople.
7. Two large groups of Muslims will fight in war.
8. A war between the Muslims and a reddish people with small eyes, wearing sandals made of hair (understood to refer tothe Mongol Tatar invasion of the Islamic lands.)
9. A peace agreement between the Muslims and non-Muslims from the yellow race (Chinese, Mongols, etc.)
10. Thirty impostors (dajjal) will appear, each thinking he is a prophet.
Present
11. Naked, destitute, barefoot shepherds will compete in building tall buildings. [The modern ex-nomads of Saudi Arabia are an excellent example of this.]
12. The slave-woman will give birth to her master or mistress.
13. A trial (fitnah) which will enter every Arab household.
14. Knowledge will be taken away (by the death of people of knowledge), and ignorance will prevail.
"Knowledge of Islam will be taken away while ignorance will increase. This removal of knowledge will be because old scholars will die and fewer and fewer new scholars will replace them. The leaders of the Muslims will be chosen from ignorant people, and they will rule