Yes — “in that day” is one of the major prophetic time-markers in the Old Testament. In the prophetic/eschatological passages it most often points to the future Day of the LORD complex: Israel’s final crisis, national repentance, cleansing, restoration, and Messiah’s reign.Actually "IN THAT DAY", yes there will be war in heaven to remove evil from it, and that war will be waged out of Zion. Then something like 3.5 years later Christ will descend to earth with the resurrected Israel to wage war against the "anti-christ" and his armies.
The strongest proof-text chain is Zechariah 12–14.
1. Israel is besieged, then YHWH intervenes “in that day”
Zechariah 12:2–3
“Behold, I will make Jerusalem a cup of trembling unto all the people round about…
And in that day will I make Jerusalem a burdensome stone for all people…”
This is not merely ancient history. The scope is international: “all the people of the earth” are gathered against Jerusalem. That places the passage in an end-time setting.
2. The house of David and Jerusalem are supernaturally defended
Zechariah 12:8–9
“In that day shall the LORD defend the inhabitants of Jerusalem…
And it shall come to pass in that day, that I will seek to destroy all the nations that come against Jerusalem.”
Again, this is national deliverance centered on Jerusalem. It is not the Church replacing Israel. The text names Jerusalem, Judah, and the house of David.
3. Israel finally looks upon the pierced Messiah
Zechariah 12:10
“And I will pour upon the house of David, and upon the inhabitants of Jerusalem, the spirit of grace and of supplications: and they shall look upon me whom they have pierced, and they shall mourn for him…”
This is the heart of the argument. The same nation that rejected/pierced Messiah finally receives divine grace, looks upon Him, and mourns in repentance.
This connects directly with the New Testament:
John 19:37
“They shall look on him whom they pierced.”
Revelation 1:7
“Behold, he cometh with clouds; and every eye shall see him, and they also which pierced him: and all kindreds of the earth shall wail because of him.”
So Zechariah’s “in that day” culminates at Messiah’s visible return.
4. The repentance is national, tribal, and deeply personal
Zechariah 12:11–14
The mourning includes: (HINT - NOT GENTILES NOR THE ALREADY RAPTURED CHURCH!)
“the house of David”
“the house of Nathan”
“the house of Levi”
“the family of Shimei”
“all the families that remain…”
That is not vague “spiritual Israel.” It is organized around Israel’s actual covenant families and leadership lines. The repentance is national, but also individual: “every family apart.”
5. “In that day” Israel is cleansed from sin
Zechariah 13:1
“In that day there shall be a fountain opened to the house of David and to the inhabitants of Jerusalem for sin and for uncleanness.”
This follows immediately after Zechariah 12:10. So the order is:
Israel is besieged → Messiah appears → Israel looks on the pierced One → national mourning/repentance → cleansing from sin.
That is exactly the salvation of a reformed/remnant nation Israel.
6. Idolatry and false prophecy are removed from the land
Zechariah 13:2
“And it shall come to pass in that day, saith the LORD of hosts, that I will cut off the names of the idols out of the land…”
This is covenant purification. Israel is not merely politically rescued; the nation is spiritually cleansed.
7. The remnant passes through refining and finally says, “The LORD is my God”
Zechariah 13:8–9
“And I will bring the third part through the fire…
they shall call on my name, and I will hear them: I will say, It is my people: and they shall say, The LORD is my God.”
This is national covenant restoration language. It echoes the old covenant formula: “I will be their God, and they shall be my people.”
8. Messiah physically returns to the Mount of Olives
Zechariah 14:4
“And his feet shall stand in that day upon the mount of Olives, which is before Jerusalem on the east…”
This locks the passage into a future, visible, earthly return of Messiah. It also matches Acts 1.
Acts 1:11–12
“This same Jesus… shall so come in like manner as ye have seen him go into heaven.”
Then the disciples return from “the mount called Olivet.”
So Zechariah 14 is not merely symbolic church language. Messiah returns to the very region from which He ascended.
9. The LORD becomes King over all the earth
Zechariah 14:9
“And the LORD shall be king over all the earth: in that day shall there be one LORD, and his name one.”
That is the Messianic kingdom. It is global, earthly, and centered on YHWH/Messiah’s rule.
