Time or days?

Everyone always says don't waste time because it goes by fast.

Now,i have heard it and even said it. I heard it alot in my 20's and even my 30's, however it is one of those things thats said to you so young that you roll it off like the words "how ya doin". Now i am older and even a little bit wiser and i really think we should be saying don't waste a day. I know this sounds corny but, how many days have we said egh i'll do it tomorrow or just blew something off. If we could take all those days,just those days and added them up we might have had enough time that we could do so much,or on one of those days something really good that would have made a impact on our life would have happened we might not worry so much about time so much.

I don't know,i do know that days go by fast,so don't waste one if you can help it. You never know what it might have in store for you.  

  TY for your time/day.    justpain