If Jesus’ disciples couldn’t know the day or the hour of his Second Coming, does this mean we could know the year or the month? Some people think we could! Some even say not knowing the day or the hour is a code for not knowing which Feast of Trumpets would be the day upon which Jesus would return. The theory is that no one knew when the Jewish new year would begin until the first crescent of the new moon was spotted, so no one knew if the 6th month would have 29 or 30 days. Well, people will imagine a great many things so that they might proceed with their latest prognostications in ‘good’ conscience.
On the other hand, those who believe no man can know the day or the hour are accused by some of rejecting prophecy of the end times altogether. The theory is, why bother studying at all, if no one could possibly know the time of Christ’s return. I don’t believe this point’s generalization works very well. What we do know from Scripture is that the final days of each age proved the universal character of mankind was all but completely corrupt. For example, Genesis 6 revealed that before the flood mankind was violent continually. The Lord judged the world but saved Noah and his family, only 8 souls. What does that say about the moral character of the antediluvian period?
The Scriptures also point to the last days of the Jewish nation in Jesus’ day, concluding that generation was evil and adulterous—one that rejected their God and Savior. Even after a second opportunity was offered them, through the preaching of the Apostles, the Jewish authorities pursued those who preached the Gospel from city, beating some in their synagogues and killing others, and continued to do so until the end came upon them in 70 AD.
Consider the last days of each of the Kingdoms of Israel and Judah. They were characterized by rebellion against God, having morals similar to that of the nations who conquered them. They were unrighteous, lovers of money rather than of God, haters, murderous, covenant breakers, liars, thieves and generally immoral.
Moreover, the final days of the priesthood of Aaron, before the high priests were derived from the family of the Hasmonians, had become completely corrupt. The they bought their office from their ruler, the King of Syria, and bargained for the opportunity to lead the Jews away from God and into the Greek manner of life. They even neglected their duties as priests in the Temple in favor of attending the games in the gymnasium.
When Jesus spoke of his own generation he spoke of those who had rejected him. It was that generation that witnessed the power of God, come in the form of miracles done by men. Yet, they refused to repent and believe the Gospel. Jesus pointed to his coming in Matthew 24:30. It was a time of the passing away of the old heavens and earth (Matthew 24:29 – i.e. the Old Covenant) and establishing the new heavens and earth, when God would dwell with men (i.e. the New Covenant – Revelation 21:1-3). It was a time of judgment (Matthew 24:30) and the resurrection of the dead (Matthew 24:31; cf. Revelation 20:11-15). In Matthew 24:30 Jesus spoke of his Second Coming in 70 AD, and it would not be delayed (cf. Matthew 24:48).
 This logic is not Scriptural. See my study on The Ancient Hebrew Calendar. The beginning of each month was known by the Jews before the month began (1Samuel 20:5, 18). The Jews did not begin their months at the first sighting of the crescent of the moon. They calculated the months and knew in advance about when the crescent would occur. It is illogical to presume that the Sabbath couldn’t be known until the crescent was spotted, because one could be working 12 hours or more before it was announced that the crescent was spotted and the Sabbath had begun at the end of the previous day! Things simply were not done this way, as the Scriptures clearly show (1Samuel 20:5, 18). The beginning of the month was known in advance of the day and the trumpet was blown to announce each new month. How could this be done, if one had to wait until someone first witnessed the crescent, which may not occur until after sunrise? The beginning of the Jewish day occurred at sundown! All odd numbered months had 30 days, and all even numbered months had 29 days. The only exception was when a 13th month was added to the calendar. It was either 29 or 30 days long, and its length alternated each time the 13th month was inserted.