Matthew 24:36
But concerning that day and hour no one knows, not even the angels of heaven, nor the Son, but the Father only.
But Christ did specify the generation:
When Jesus used the expression, “this generation” He always meant the generation of His contemporaries.
“To what then shall I compare the men of this generation, and what are they like?” (Luke 7:31).
“But to what shall I compare this generation? It is like children sitting in the market places, who call out to the other children” (Matthew 11:16).
“The men of Nineveh will stand up with this generation at the judgment, and will condemn it because they repented at the preaching of Jonah; and behold, something greater than Jonah is here” (Matthew 12:41).
“The Queen of the South will rise up with this generation at the judgment and will condemn it, because she came from the ends of the earth to hear the wisdom of Solomon; and behold, something greater than Solomon is here” (Matthew 12:42).
Sighing deeply in His spirit, He said, “Why does this generation seek for a sign? Truly I say to you, no sign will be given to this generation” (Mark 8:12).
As the crowds were increasing, He began to say, “This generation is a wicked generation; it seeks for a sign, and yet no sign will be given to it but the sign of Jonah” (Luke 11:29).
“For just as Jonah became a sign to the Ninevites, so will the Son of Man be to this generation” (Luke 11:30).
“The Queen of the South will rise up with the men of this generation at the judgment and condemn them, because she came from the ends of the earth to hear the wisdom of Solomon; and behold, something greater than Solomon is here” (Luke 11:31).
“The men of Nineveh will stand up with this generation at the judgment and condemn it, because they repented at the preaching of Jonah; and behold, something greater than Jonah is here” (Luke 11:32).
“so that the blood of all the prophets, shed since the foundation of the world, may be charged against this generation” (Luke 11:50).
“from the blood of Abel to the blood of Zechariah, who was killed between the altar and the house of God; yes, I tell you, it shall be charged against this generation” (Luke 11:51).
“Truly I say to you, all these things will come upon this generation” (Matthew 23:36).
“But first He must suffer many things and be rejected by this generation” (Luke 17:25).
“Truly I say to you, this generation will not pass away until all things take place” (Luke 21:32).
“Truly I say to you, this generation will not pass away until all these things take place.” (Matthew 24:34).