Imaging a world without time. I agree that we measure the going by of time, but that measurement always begins from NOW (the present moment). One could measure an hour from now or a year from now, but now is always the reference point. NOW, itself, does not change because it is always NOW. Since what we call time is continually passing that which we call NOW, now becomes the reference point to compare changes from within it. For example, you have never been older then whatever age you are now. It was NOW when you were a child and it is still now regardless of your current age. Your body has changed and your mind has changed but the fact that it is NOW, has not changed.