He is right. These people will owe us an apology...then again, if they are right, I will gladly apologize to them. The Bible says "But of that day and hour no one knows, not even the angels of heaven, but My Father only" (Matthew 24:36).
We don't know the Day or the hour, but we can certainly know the "signs of the times." See Matthew 24, Luke 21, 2 Timothy 3 and many other passages. And keep your eyes on Israel. He is coming:
"...when the Lord Jesus is revealed from heaven with His mighty angels, in flaming fire taking vengeance on those who do not know God, and on those who do not obey the gospel of our Lord Jesus Christ. These shall be punished with everlasting destruction from the presence of the Lord and from the glory of His power, when He comes, in that Day, to be glorified in His saints and to be admired among all those who believe, because our testimony among you was believed" (2 Thessalonians 1:7-10)