Wars are coming. Psalm 83. Ezekiel 38, 39. Revelation 19:11-21.
The prophet Amos spoke of this Dark Day for Israel and her people. Amos 5:18-20.
The Hebrew prophet Zephaniah spoke of it as a day of wrath. Zephaniah 1:14-16. It is then a time of wrath from the Lord on His people and the Gentiles to make them both repent and to finally come into the New Covenant (Jeremiah 31:31) established through L’Adonai Yeshua/The Lord Jesus.
The prophet Joel warned of a future day when the heavens will be divinely darkened as the day of the Lord starts. Joel 2:31.
The apostle John also describes this cosmic disturbance & darkness. Revelation 6:12-17.