Yeshua said that nobody knows the precise day and hour of his return, and I believe this also means we can't know the year or even the decade very far in advance. We should be able to tell that the time is getting closer by observing the events in the world around us, but I think that's as precise as we can get. However, the real point of Yeshua's warning to be ready for his return is to be ready "in season and out". Make disciples of other men today and be a better disciple yourself every day.