Matthew 25:6 And at midnight a cry was heard: ‘Behold, the bridegroom is coming; go out to meet him!’
If you want to be prepared for an event which you know is going to happen on a specific date, you try to organise things so you are ready before or on that date.
But what happens when you do not know the exact date, like a birth of a child? You start to get ready when the date gets closer and remain prepared.
The Jews did not know when their Messiah would come. We do not know when Christ will return. We do not know the date at all.
What we can do is to get ready so no matter what date, whether during our lifespan of after it, we will be ready to enter into God’s kingdom with Christ!