Here is part of the text in which Jesus provides the key signs of the end times (Luke 21).
Great Signs from Heaven
Luk 21:7 And they asked Him, saying, Teacher, but when shall these things be? And what shall be the sign when these things are about to take place?
Luk 21:8 And He said, Take heed that you are not deceived, for many shall come in My name, saying, I AM! Also, The time has come! Do not go after them.
Luk 21:9 But when you hear of wars and disturbances, do not be terrified, for all these things must first occur, but the end is not at once.
Luk 21:10 And He said to them, Nation shall rise against nation, and kingdom against kingdom.
Luk 21:11 And great earthquakes shall be in different places, and famines and plagues. And there shall be terrors and great signs from Heaven.
Luk 21:12 But before all these, they shall lay their hands on you and persecute you, delivering you up to the synagogues and prisons, being brought before kings and rulers for My name's sake.
(I'll add more about this later. I'm having trouble getting the software at this site to keep what I'm posting.)