Very specific, day and hour only mentioned, nothing about a year etc.
Maybe (?) the reason Jesus doesn't know the day or hour is to do with fitting in with Jewish tradition, the likes of the following.
Jesus said the likes of, I will go away and prepare a place for you, in my Fathers house are many dwellings/houses. When a Jew was to marry a lass, he would prepare the Fathers house ready for the Bride to come to. The Father is the one that would OK the sons preparations and when it was to the Fathers liking, he would then give the OK to the Son to fetch the Bride. Groom and best men etc would go down the road, sounding the trumpet etc.
Jesus returns with the sounding of the Trump of God.
