Mt 24:14, 1 Th 5:1-2, 2 Pt 3:10
Before Jesus ascended to heaven, his disciples asked Jesus when Israel would be restored. But Jesus says that only God knows at that time and commands you to do world evangelization. (Act 1:6-8)
Act 1:6 When they therefore were come together, they asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel? 7 And he said unto them, It is not for you to know the times or the seasons, which the Father hath put in his own power. 8 But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.
We do not know when the end of the world, or in other words, the second coming of Jesus. However, it is clear that the end will come when the gospel that Jesus is the Christ is preached throughout the world. (Mt 24:14)
Mt 24:14 And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come.
And surely the gospel will be preached all over the world, and the Lord will come. (1 Thess 5:1-2, 2 Pt 3:10)
1 Thess 5:1 But of the times and the seasons, brethren, ye have no need that I write unto you. 2 For yourselves know perfectly that the day of the Lord so cometh as a thief in the night.
2 Pt 3:10 But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.