Zechariah 14:7

But it shall be one day
A very singular, remarkable, and uncommon one; and it will be but one day; things will not continue long in such a position: which shall be known to the Lord;
all times and seasons are known unto the Lord, but this will come under his special notice and observation, and be under the direction of his special providence; it will only be taken notice of by him, and not by others; scarce any will observe it, or know what God is doing in it, or about to do: not day, nor night;
not clear and full day, as at noon; nor yet quite night or dark, as at midnight; (See Gill on Zechariah 14:6): but it shall come to pass, [that] at evening time it shall be light;
after this day is over, which is neither clear nor dark, there will be an evening time; things will be worse with us than they are; the sun will be set; Christ will be withdrawn in the ministry of the word; his witnesses will be slain and silenced; great coldness and lukewarmness will seize upon professors; great darkness of error will spread itself everywhere; great sleepiness and security will fall upon all the virgins, and there will be great distress of nations; and, when it will be feared and expected that greater darkness and distress still are coming on, "light" will break forth; deliverance and salvation from Popish darkness and tyranny will be wrought; the light of the Gospel will break forth, and spread itself everywhere; the light of joy and gladness will arise to all the saints, and it will be a time of great spiritual peace, prosperity, and happiness. Vitringa on ( Isaiah 60:20 ) , interprets it there shall be no vicissitude, or succession of day and night, but all day; at evening it shall be light; no calamity nor sorrow; Christ the light, and sun of righteousness, will break out in a glorious and spiritual manner.