Below I want to list bibleverses about the darkness at the Day of the Lord.
Blow the trumpet in Zion, And sound an alarm in My holy mountain! Let all the inhabitants of the land tremble; For the day of the Lord is coming, For it is at hand:
A day of darkness and gloominess, A day of clouds and thick darkness, Like the morning clouds spread over the mountains. A people come, great and strong, The like of whom has never been; Nor will there ever be any such after them, Even for many successive generations.
joël 2:1-2
'Woe to you who desire the day of the Lord ! For what good is the day of the Lord to you? It will be darkness, and not light.
Is not the day of the Lord darkness, and not light? Is it not very dark, with no brightness in it?
Amos 5:18,20
The great day of the Lord is near; It is near and hastens quickly. The noise of the day of the Lord is bitter; There the mighty men shall cry out.
That day is a day of wrath, A day of trouble and distress, A day of devastation and desolation, A day of darkness and gloominess, A day of clouds and thick darkness, A day of trumpet and alarm Against the fortified cities And against the high towers.
Zephaniah 1:14-16