Why do so many people think that no one can know the exact time of Christ's second coming? In Matthew 16:3, Jesus rebuked the Pharisees and the Sadducees, because they could not discern the signs of the times. Jesus then tells them the only sign they will receive is the sign of the prophet Jonah. This is very interesting. In Chapter Nine of the book of Daniel, the angel Gabriel gives Daniel the prophecy of the seventy weeks. He tells Daniel that when the decree goes out to rebuild Jerusalem, which happened in 455 B.C., sixty nine weeks (or 483 years) later the Messiah will be cut off and killed. Subtract 455 from 483 and you arrive at the year 28 A.D. It is the year 28 A.D. when Jesus is talking with the Pharisees and the Sadducess as recorded in Matthew 16:3. The learned leaders of the Hebrew people know all too well the significance of Jesus' presence at this time in history. This is why Jesus does not give the leaders a sign pertaining to his coming, they already know he is here. Instead, Jesus points to Jonah as the sign for his resurrection.