Jesus is now in heaven, he must know his time of second coming.
We don't know the day, but the return is the biggest topic in the Bible, there is no shortage of references that should be considered before any conclusions are drawn. Covering the 24 references to the term, 'day of the Lord' ended up being about 40 pages long when examine in as much detail as I could. When you add in all the other references, it is quite easy to show the sealing of certain people is the 1st event.
Re:6:1-2:
And I saw when the Lamb opened one of the seals,
and I heard,
as it were the noise of thunder,
one of the four beasts saying,
Come and see.
And I saw,
and behold a white horse:
and he that sat on him had a bow;
and a crown was given unto him:
and he went forth conquering,
and to conquer.
Isa:49:2:
And he hath made my mouth like a sharp sword;
in the shadow of his hand hath he hid me,
and made me a polished shaft;
in his quiver hath he hid me;
Re:8:2-6:
And I saw the seven angels which stood before God;
and to them were given seven trumpets.
And another angel came and stood at the altar,
having a golden censer;
and there was given unto him much incense,
that he should offer it with the prayers of all saints upon the golden altar which was before the throne.
And the smoke of the incense,
which came with the prayers of the saints,
ascended up before God out of the angel's hand.
And the angel took the censer,
and filled it with fire of the altar,
and cast it into the earth:
and there were voices,
and thunderings,
and lightnings,
and an earthquake.
And the seven angels which had the seven trumpets prepared themselves to sound.
4 days for the 1st four trumps, 3 1/2 years after the 5th trump sounds, 3 1/2 hours to pour out all 7 vials starting 1 hour after the two witnesses are resurrected, by 6PM of that same day the Re:20:4 resurrection will have taken place. All people will be 'spiritual beings' like Jesus was:
Joh:20:17:
Jesus saith unto her,
Touch me not;
for I am not yet ascended to my Father:
but go to my brethren,
and say unto them,
I ascend unto my Father,
and your Father;
and to my God,
and your God.
Zec:13:8-9:
And it shall come to pass,
that in all the land,
saith the LORD,
two parts therein shall be cut off and die;
but the third shall be left therein.
And I will bring the third part through the fire,
and will refine them as silver is refined,
and will try them as gold is tried:
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.
Zec:14:1-8:
Behold,
the day of the LORD cometh,
and thy spoil shall be divided in the midst of thee.
For I will gather all nations against Jerusalem to battle;
and the city shall be taken,
and the houses rifled,
and the women ravished;
and half of the city shall go forth into captivity,
and the residue of the people shall not be cut off from the city.
Then shall the LORD go forth,
and fight against those nations,
as when he fought in the day of battle.
And his feet shall stand in that day upon the mount of Olives,
which is before Jerusalem on the east,
and the mount of Olives shall cleave in the midst thereof toward the east and toward the west,
and there shall be a very great valley;
and half of the mountain shall remove toward the north,
and half of it toward the south.
And ye shall flee to the valley of the mountains;
for the valley of the mountains shall reach unto Azal:
yea,
ye shall flee,
like as ye fled from before the earthquake in the days of Uzziah king of Judah:
and the LORD my God shall come,
and all the saints with thee.
And it shall come to pass in that day,
that the light shall not be clear,
nor dark:
But it shall be one day which shall be known to the LORD,
not day,
nor night:
but it shall come to pass,
that at evening time it shall be light.
And it shall be in that day,
that living waters shall go out from Jerusalem;
half of them toward the former sea,
and half of them toward the hinder sea:
in summer and in winter shall it be.
Eze:47:1-2:
Afterward he brought me again unto the door of the house;
and,
behold, waters issued out from under the threshold of the house eastward:
for the forefront of the house stood toward the east,
and the waters came down from under from the right side of the house,
at the south side of the altar.
Then brought he me out of the way of the gate northward,
and led me about the way without unto the utter gate by the way that looketh eastward;
and,
behold,
there ran out waters on the right side.
.
.
Eze:47:7-9:
Now when I had returned,
behold,
at the bank of the river were very many trees on the one side and on the other.
Then said he unto me,
These waters issue out toward the east country,
and go down into the desert,
and go into the sea:
which being brought forth into the sea,
the waters shall be healed.
And it shall come to pass,
that every thing that liveth,
which moveth,
whithersoever the rivers shall come,
shall live: and there shall be a very great multitude of fish,
because these waters shall come thither:
for they shall be healed;
and every thing shall live whither the river cometh.
.
.
Eze:47:12:
And by the river upon the bank thereof,
on this side and on that side,
shall grow all trees for meat,
whose leaf shall not fade,
neither shall the fruit thereof be consumed:
it shall bring forth new fruit according to his months,
because their waters they issued out of the sanctuary:
and the fruit thereof shall be for meat,
and the leaf thereof for medicine.
Joh:7:39:
(But this spake he of the Spirit,
which they that believe on him should receive:
for the Holy Ghost was not yet given;
because that Jesus was not yet glorified.)
God took Jesus to New Jerusalem after He said that and had Him back in Jerusalem by 6PM to baptize 11 people in a small room. In those 40 days He was back He was in an immortal body, like all people who have entered the grave and returned from it will also be glorified in the same way. Re:21 is for the ones saved in the final verses from Re:20.