And it shall come to pass in that day, that the light shall not be clear, nor dark:

Wesley's Notes

14:6 In that day - While God is fighting with the enemies of his church, the nations that fought against Jerusalem. Nor dark - There shall be some mercy to allay the bitterness of judgment, and some judgment with our mercy.

King James Translators' Notes

that the...: that is, it shall not be clear in some places, and dark in other places of the world

clear: Heb. precious

dark: Heb. thickness

Jamieson-Fausset-Brown Bible Commentary

6. light . not . clear . dark-Jerome, Chaldee, Syriac, and Septuagint translate, "There shall not be light, but cold and ice"; that is, a day full of horror (Am 5:18). But the Hebrew for "clear" does not mean "cold," but "precious," "splendid" (compare Job 31:26). Calvin translates, "The light shall not be clear, but dark" (literally, "condensation," that is, thick mist); like a dark day in which you can hardly distinguish between day and night. English Version accords with Zec 14:7: "There shall not be altogether light nor altogether darkness," but an intermediate condition in which sorrows shall be mingled with joys.

Matthew Henry's Concise Commentary

14:1-7 The Lord Jesus often stood upon the Mount of Olives when on earth. He ascended from thence to heaven, and then desolations and distresses came upon the Jewish nation. Such is the view taken of this figuratively; but many consider it as a notice of events yet unfulfilled, and that it relates to troubles of which we cannot now form a full idea. Every believer, being related to God as his God, may triumph in the expectation of Christ's coming in power, and speak of it with pleasure. During a long season, the state of the church would be deformed by sin; there would be a mixture of truth and error, of happiness and misery. Such is the experience of God's people, a mingled state of grace and corruption. But, when the season is at the worst, and most unpromising, the Lord will turn darkness into light; deliverance comes when God's people have done looking for it.