"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.