when.

Mark 15:25
It was the third hour when they crucified Him.

Matthew 27:45
From the sixth hour until the ninth hour darkness came over all the land.

Luke 23:44, 45
It was now about the sixth hour, and darkness came over all the land until the ninth hour. . . .

darkness.

Psalm 105:28
He sent darkness, and it became dark--for had they not defied His words?

Isaiah 50:3, 4
I clothe the heavens in black and make sackcloth their covering. . . .

Amos 8:9, 10
"And in that day, " declares the Lord GOD, "I will make the sun go down at noon; and I will darken the earth in the daytime. . . .