'Day' in the Bible

Jehovah is good, a stronghold in the day of trouble; and he knoweth them that trust in him.

The shield of his mighty men is made red, the valiant men are in scarlet: the chariots glitter with the sheen of steel, in the day of his preparation, and the spears are brandished.

Nineveh hath been like a pool of water, since the day she existed, yet they flee away. ... Stand! Stand! But none looketh back.

Thy chosen men are as the locusts, and thy captains as swarms of grasshoppers, which camp in the hedges in the cold day: when the sun ariseth they flee away, and their place is not known where they are.