No we are NOT to know the DAY or the HOUR!
But we ARE to KNOW the SEASON.
Matthew 24 - Jesus was very critical of those who claim to be able to tell the signs of upcoming weather but who ignore the very signs of His soon return!
When we see the fig tree begin to blossom, we know the SEASON of Spring is very near.
When we see the signs of the time begin to happen (and these signs are all around us like the fast increasing birth pains of a woman about to give birth) then we are to KNOW the time of His Return is VERY near!
This one is EASY!
Since we'd divided the world up into TIME ZONES for our clocks, there are at least 24 DIFFERENT 'hours' and 2 DAYS in existance, RIGHT NOW, on any place on earth.
So unless we'd ALL use UTM (which we don't) it is scientifically IMPOSSIBLE to know the day or hour.