'Evening' in the Bible

Now the men of Israel were hard pressed on that day, because Saul had made the army take an oath, saying, "Cursed be the man who eats [any] food until evening, when I will have avenged myself on my enemies!" So none of the army tasted [any] food.

David said to Jonathan, "Look, tomorrow [is] the new moon, and I should certainly sit with the king to eat. You must send me away so that I can hide myself in the field until the third evening.

Then David attacked them from twilight until the evening of the next day. Not a man of them escaped {except} four hundred young men who rode [off] on camels and fled.