It's Good Friday for us Christians.
A holy day; a solemn day. But a Good day? Yes. Oh, yes.
It is good to reflect on the agony Christ endured on our behalf. Not merely the agony of the Cross (from where we get the term excruiating), though that was severe enough.
But Christ's real agony was knowing that God - Father - Abba (Daddy!!) - had turned His face away from the Son He had loved since before the beginning of the world. "He who knew no sin became sin" on our behalf, and the Holy God turned away in disgust.
That is why Jesus cried out, "My God, my God, why have you forsaken me?" and then, "It is finished." For at that moment, it WAS finished, for all time. "For God so loved the world that He gave his only begotten Son, that all who believe in him might not perish, but have eternal life."
A very good day, indeed.
May your Good Friday be blessed.