There is no need to worry about when the world will end. It will not end before the Son returns. About that, Jesus said this:
“But about that day or hour no one knows, not even the angels in heaven, nor the Son, but only the Father. As it was in the days of Noah, so it will be at the coming of the Son of Man. For in the days before the flood, people were eating and drinking, marrying and giving in marriage, up to the day Noah entered the ark; and they knew nothing about what would happen until the flood came and took them all away. That is how it will be at the coming of the Son of Man. Two men will be in the field; one will be taken and the other left. Two women will be grinding with a hand mill; one will be taken and the other left.
Therefore keep watch, because you do not know on what day your Lord will come. But understand this: If the owner of the house had known at what time of night the thief was coming, he would have kept watch and would not have let his house be broken into. So you also must be ready, because the Son of Man will come at an hour when you do not expect him.” (Matthew 24: 36-44)
Jesus tells us to not worry about when He will return. We should only consider that He will and we must be ready. It is wise, therefore, to always be ready.
Do not fret about the signs of the end times (you cannot predict His coming).
Do not worry about predictions man makes (not even Jesus knows the day or the hour).
We should not worry about when it will happen. We already know that it will.