God uses this question to rebuke the people for saying that they want the day of Yahweh to be soon. This can be translated as a statement. AT: "You long for the day of Yahweh." or "You should not long for the day of Yahweh!" (See: [[rc://en/ta/man/translate/figs-rquestion]])
Here "darkness" represents a time when disasters happen, and "light" represents a time when good things happen. AT: "It will be a time of darkness and disaster, not of light and blessing" or "On that day there will be disasters, not blessings" (See: [[rc://en/ta/man/translate/figs-metaphor]])