A couple of favorite verses to get the day started:
Then he said unto them, Go your way, eat the fat, and drink the sweet, and send portions unto them for whom nothing is prepared: for this day is holy unto our LORD: neither be ye sorry; for the joy of the LORD is your strength. --Nehemiah 8:10, KJV
And, from the prophet who brought you Lamentations and weeping:
For I know the thoughts that I think toward you, saith the LORD, thoughts of peace, and not of evil, to give you an expected end. Jeremiah 29:11 KJV
For I know the plans I have for you, says the LORD, plans for welfare and not for evil, to give you a future and a hope. Jeremiah 29:11 RSV
All our joy is in the Lord here and now in the eternal present. When we lift ourselves beyond the mere passage of time and join Him, however briefly, then we experience joy.