Prov. 29:2 states - When the righteous are in authority, the people Rejoice: but when the wicked bear[eth] rule, the people mourn. This the golden time of day for the righteous, and a good moment, in time, to Rejoice. Every day is an opportunity to be the "salt of the earth", and is, a good day.
We as born again citizen of the Kingdom of Heaven, on earth, know that we have a choice in the matter; we can feel joyful - or not. We can be glad - or not. We can glory - or not. We simply must stay in the fact, that Christ Jesus is our King, and where we operate, is His Kingdom; He is in Authority.
Our prayer [Matt.6:9] "Thy Kingdom come, on earth..." Vision [John 3:3-7] "Born of water, and of Spirit, to see the Kingdom." Where [Luke 17:21] "The Kingdom of Heaven, is inside of you." How [Rom.21:2] by Not conforming to this world, but being transformed, by the renewing, of the mind.
The Tree of Knowledge of Good and Evil is a dead spirit talking. This Tree had His name changed to Death because man fell and Death entered into the world. The sentence, and the "Law of Death" was satisfied with the death of Christ, on the Cross. Those in the world are following a king with a death sentence; these be the "mourners"; they whine, complain, and blame - that is their fruit.
Jer.31:13 speaks of a New Day; why not practice Rejoicing today? Matt.5:12 "Rejoice and be exceedingly glad." Luke 6:23 Rejoice ye in that day."
Rejoice in the Lord, always: again I say "REJOICE."