http://www.newadvent.org/fathers/0831.htm
After the taking up of our Lord Jesus Christ, I John was alone upon Mount Tabor, where also He showed us His undefiled Godhead; and as I was not able to stand, I fell upon the ground, and prayed to the Lord, and said: O Lord my God, who has deemed me worthy to be Your servant, hear my voice, and teach me about Your coming. When You shall come to the earth, what will happen? The heaven and the earth, and the sun and the moon, what will happen to them in those times? Reveal to me all; for I am emboldened, because You listen to Your servant.
And I spent seven days praying; and after this a cloud of light caught me up from the mountain, and set me before the face of the heaven. And I heard a voice saying to me: Look up, John, servant of God, and know. And having looked up, I saw the heaven opened, and there came forth from within the heaven a smell of perfumes of much sweet odour; and I saw an exceeding great flood of light, more resplendent than the sun. And again I heard a voice saying to me: Behold, righteous John. And I directed my sight, and saw a book lying, of the thickness, methought, of seven mountains; and the length of it the mind of man cannot comprehend, having seven seals. And I said: O Lord my God, reveal to me what is written in this book. And I heard a voice saying to me: Hear, righteous John. In this book which you see there have been written the things in the heaven, and the things in the earth, and the things in the abyss, and the judgments and righteousness of all the human race. And I said: Lord, when shall these things come to pass? And what do those times bring? And I heard a voice saying to me: Hear, righteous John. There shall be in that time abundance of grain and wine, such as there has never been upon the earth, nor shall ever be until those times come. Then the ear of grain shall produce a half chœnix, and the bend of the branch shall produce a thousand clusters, and the cluster shall produce a half jar of wine; and in the following year there shall not be found upon the face of all the earth a half chœnix of grain or a half jar of wine.
And again I said: Lord, thereafter what will You do? And I heard a voice saying to me: Hear, righteous John. Then shall appear the denier, and he who is set apart in the darkness, who is called Antichrist. And again I said: Lord, reveal to me what he is like. And I heard a voice saying to me: The appearance of his face is dusky; the hairs of his head are sharp, like darts; his eyebrows like a wild beast’s; his right eye like the star which rises in the morning, and the other like a lion’s; his mouth about one cubit; his teeth span long; his fingers like scythes; the print of his feet of two spans; and on his face an inscription, Antichrist; he shall be exalted even to heaven, and shall be cast down even to Hades, making false displays. And then will I make the heaven brazen, so that it shall not give moisture upon the earth; and I will hide the clouds in secret places, so that they shall not bring moisture upon the earth; and I will command the horns of the wind, so that the wind shall not blow upon the earth.
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There are only three and a half years left the first three and a half years was when Christ was here he started his ministry at 30 and died 3 years later this was the first part of the tribulation.Revelations and Daniel speak of times time and dividing of times.It also speaks of 1260 days which is 3 1/2 Hebrew years.And it says 42 months never is 7 years mentioned in Revelation.