This is the day the Lord has made

Psalm 118:24 says,
This is the day the Lord has made; I shall rejoice and be glad in it."

I am reading a book called Every Day Deserves a Chance: Wake Up to the Gift of 24 Hours by Max Lucado. In this book he talks about this verse. First, he says,the verse says "this." This day, today. God gave us this day. Today. Yesterday is history - it can't be changed. Tomorrow isn't here yet. We are given today.
He goes on to make obsevations about the rest of the verse, and he ends with the phrase "be glad in it." We are to be glad during this day - "in" this day. No matter what happens during the day, no matter if it's a work day, a sad day, a terible. horrible no good very bad day - orif it's a great day, the best day ever. We are to rejoice and be glad as the day is going by. Not just as we get up in the morning, or during our bedtime prayers, but all day long - in the day. So as I am driving to work I will be glad. As I answer phone call from crabby parents I will be glad. As I relax on my deck, or weed the garden, or shovel snow again, in the good moments and the bad, I will be glad. Why? Because the Lord made this day, and He made me. And, when I am glad in the moment, it changes me. It makes me a more pleasant person to be around. It makes me more thankful to God, and helps to deepen my relationship with Him.
Every day is a day that the Lord has made; I will rejoice and be glad every moment of this gift of a day.