Well it crossed my mind.

I didnt learn to tell the time. Just point and show me your watch

What if that person has no watch ? In that case, my advice to you would be ; guess the time by looking up the sky and judge it by the position of  the sun. In a sunny day of course.

I will remember the tip  

Me too, I didn´t learn the time and I think I´ll never do . You always have mobile phone for that