Click the clock in the lower right corner of your screen and you get a calendar. Now you can count the days on your fingers. You do have fingers, right?
Now there's less than 31 days left until Halloween. So today is 10/6/16 right? Okay so subtract 31 from 6. The answer is 25. So there are now 25 days left until Halloween.
Just look up days until halloween, many countdown websites come up.