'Day' in the Bible

The Lord is good,A strength and stronghold in the day of trouble;He knows [He recognizes, cares for, and understands fully] those who take refuge and trust in Him.

Like tangled thorn branches [gathered for fuel],And like those drowned in drunkenness,The people of Nineveh are consumed [through fire]Like stubble completely withered and dry [in the day of the Lord’s wrath].

The shields of his soldiers [of Media and Babylon] are colored red;The warriors are dressed in scarlet.The chariots blaze with fire of [flashing] steelWhen he is prepared to march,And the cypress spears are brandished [for battle].

Your guardsmen are like the swarming locusts.Your marshals are like the hordes of grasshoppersSettling in the stone walls on a cold day.When the sun rises, they fly away,And no one knows the place where they are.