Zephaniah 1:15

That day [is] a day of wrath
Both of the wrath of God against his people for their sins; these judgments being the effects of his wrath, provoked by their iniquities; and of the wrath and cruelty of the Chaldeans, exercised in a furious manner: a day of trouble and distress;
to the inhabitants of Jerusalem, they being taken and led captive, their houses plundered and demolished, and the whole city and temple laid in ruins: a day of wasteness and desolation;
of the whole country of Judea, and the metropolis of it; of their houses, fields, and vineyards: a day of darkness and gloominess, a day of clouds and thick
darkness:
as it might be in a natural sense; the displeasure of God being shown in the very heavens, by the darkness and gloominess of them, and the thick clouds with which they were covered; and made still more dark and gloomy by the burning of the city, and the smoke of it; and, in such circumstances, gloominess and melancholy must sit upon the minds of men: and thick clouds and darkness portend greater troubles and calamities coming on; and the whole is expressive of great adversity; for, as light frequently designs prosperity, so darkness adversity.