Why Catholics must never chart the end of the world

But he that shall endure unto the end,
the same shall be saved.

Matthew 24:13

And he that overcometh,
and keepeth My works unto the end,
to him will I give power over the nations:

Revelation 2:26

He is not the end, but the beginning!
For Christ is the end of the law for righteousness
to every one that believeth.

Romans 10:4

I am Alpha and Omega, the beginning and the ending,
saith the Lord,
which is, and which was, and which is to come, the Almighty.

Revelation 1:8

For we are not a superstition, but a faith And we are not just a faith, but the faith, graced in fullness through the Lord of all Creation, Jesus Christ.
Teaching them to observe all things whatsoever I have commanded you:
and, lo,
I am with you alway,
even unto the end of the world. Amen.

Matthew 28:20

For the Lord once said:

"'Take care not to be deceived,' he said, 'because many will come using my name and saying, 'I am he,' and 'The time is near at hand.' Refuse to join them. And when you hear of wars and revolutions, to not be frightened, for this is something that must happen but the end is not so soon." Revelation 21:5-11 

This is Revelation 21:5-11....

And He that sat upon the throne said,
Behold, I make all things new.
And He said unto me,
Write: for these words are true and faithful.
And He said unto me, It is done.
I am Alpha and Omega, the beginning and the end.
I will give unto him that is athirst of the fountain of the water of life freely.
He that overcometh shall inherit all things;
and I will be his God, and he shall be My son.
But the fearful, and unbelieving,
and the abominable, and murderers,
and whoremongers, and sorcerers,
and idolaters, and all liars,
shall have their part in the lake which burneth with fire and brimstone:
which is the second death.
And there came unto me one of the seven angels which had the seven vials full of the seven last plagues,
and talked with me, saying, Come hither,
I will shew thee the bride, the Lamb's wife.
And He carried me away in the spirit to a great and high mountain,
and shewed me that great city, the holy Jerusalem,
descending out of heaven from God,
Having the glory of God:
and Her light was like unto a stone most precious,
even like a jasper stone, clear as crystal;

Revelation 21:5-11

What you quoted
is bits and pieces of Matthew 24, and Luke 21.
A mish mash of the Lord's flesh, drained of His blood.
(As the many tend to do.)

For many shall come in My name, saying, I am Christ[ian]
and shall deceive many.

Matthew 24:5

And while they exalt their faith, 
they forget to praise the LORD Wub
`Paul


And He said, 
Take heed that ye be not deceived: 
for many shall come in My name, saying, I am Christ[ian]
and the time draweth near: 
go ye not therefore after them.
Luke 21:8