Matthew 24:36

And concerning that day and the hour no one hath known -- not even the messengers of the heavens -- except my Father only;

Acts 1:7

and he said unto them, 'It is not yours to know times or seasons that the Father did appoint in His own authority;

Matthew 25:13

'Watch therefore, for ye have not known the day nor the hour in which the Son of Man doth come.

Mark 13:32

And concerning that day and the hour no one hath known -- not even the messengers who are in the heaven, not even the Son -- except the Father.

1 Thessalonians 5:2

for yourselves have known thoroughly that the day of the Lord as a thief in the night doth so come,

Zechariah 14:7

And there hath been one day, It is known to Jehovah, not day nor night, And it hath been at evening-time -- there is light.

Matthew 24:42

'Watch ye therefore, because ye have not known in what hour your Lord doth come;

Matthew 24:44

because of this also ye, become ye ready, because in what hour ye do not think, the Son of Man doth come.

2 Peter 3:10

and it will come -- the day of the Lord -- as a thief in the night, in which the heavens with a rushing noise will pass away, and the elements with burning heat be dissolved, and earth and the works in it shall be burnt up.

Revelation 3:3

'Remember, then, how thou hast received, and heard, and be keeping, and reform: if, then, thou mayest not watch, I will come upon thee as a thief, and thou mayest not know what hour I will come upon thee.

Revelation 16:15

lo, I do come as a thief; happy is he who is watching, and keeping his garments, that he may not walk naked, and they may see his unseemliness,' --

Treasury of Scripture Knowledge

Summary

But of that day and hour knoweth no man, no, not the angels of heaven, but my Father only.

Bible References

General references

Matthew 24:42
'Watch ye therefore, because ye have not known in what hour your Lord doth come;
Matthew 25:13
'Watch therefore, for ye have not known the day nor the hour in which the Son of Man doth come.
Zechariah 14:7
And there hath been one day, It is known to Jehovah, not day nor night, And it hath been at evening-time -- there is light.
Mark 13:32
And concerning that day and the hour no one hath known -- not even the messengers who are in the heaven, not even the Son -- except the Father.
Acts 1:7
and he said unto them, 'It is not yours to know times or seasons that the Father did appoint in His own authority;
1 Thessalonians 5:2
for yourselves have known thoroughly that the day of the Lord as a thief in the night doth so come,
2 Peter 3:10
and it will come -- the day of the Lord -- as a thief in the night, in which the heavens with a rushing noise will pass away, and the elements with burning heat be dissolved, and earth and the works in it shall be burnt up.
Revelation 3:3
'Remember, then, how thou hast received, and heard, and be keeping, and reform: if, then, thou mayest not watch, I will come upon thee as a thief, and thou mayest not know what hour I will come upon thee.
Revelation 16:15
lo, I do come as a thief; happy is he who is watching, and keeping his garments, that he may not walk naked, and they may see his unseemliness,' --