Passage
And it hath come to pass, in that day, The precious light is not, it is dense darkness,
And it hath come to pass, in that day, The precious light is not, it is dense darkness,
Zechariah 14:4 And stood have His feet, in that day, On the mount of Olives, That <FI>is<Fi> before Jerusalem eastward, And cleft hath been the mount of Olives at its midst, To the east, and to the west, a very great valley, And removed hath the half of the mount towards the north. And its half towards the south.
Zechariah 14:5 And ye have fled <FI>to<Fi> the valley of My mountains, For join doth the valley of the mountains to Azal, And ye have fled as ye fled before the shaking, In the days of Uzziah king of Judah, And come in hath Jehovah my God, All holy ones <FI>are<Fi> with Thee.
Zechariah 14:6 And it hath come to pass, in that day, The precious light is not, it is dense darkness,
Zechariah 14:7 And there hath been one day, It is known to Jehovah, not day nor night, And it hath been at evening-time--there is light.
Zechariah 14:8 And it hath come to pass, in that day, Go forth do living waters from Jerusalem, Half of them unto the eastern sea, And half of them unto the western sea, In summer and in winter it is.
The verse centers on "light", "darkness", "hath", "come", "pass", "precious", and "dense". It is saying that the contrast between light and darkness marks a real divide in how people respond to God's work.
The nearby context moves from verse 5's "And ye have fled FI to Fi..." into verse 7's "And there hath been one day It...", so "light" and "darkness" belong inside that flow. In Zechariah context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "light" and "darkness" with trust shaped by these words, not by a vague optimism outside the passage.