"You can know his return" even "right at the door" (Matt. 24.33).
I know when my friend comes over today, I just don't know the hour.
Verses that say you can't know the day or hour have to do with:
1) because you are being carnal;
2) end of the world (not Jesus' return);
3) just the "hour," for "day" is not mentioned;
4) because Israel was not a nation again.
