The lamb was prepared between high noon and sunset on Nissan 14th.

Numbers 9:1-5

CLV 1 Yahweh spoke to Moses in the wilderness of Sinai in the second year of their coming forth from the land of Egypt, in the first month, saying. 2 The sons of Israel shall observe the passover at its appointed time. 3 On the fourteenth day of this month, between the evening hours, you shall observe it at its appointed time according to all its statutes, and according to all its customs shall you prepare it. 4 Then Moses spoke to the sons of Israel to observe the passover. 5 So they observed the passover in the first month on the fourteenth day of the month, between the evening hours, in the wilderness of Sinai. According to all that Yahweh had instructed Moses, so did the sons of Israel.

They ate the passover lamb at night. It was a full moon lit night.

Exodus 12:2-11

KJV 2 This month shall be unto you the beginning of months: it shall be the first month of the year to you. 3 Speak ye unto all the congregation of Israel, saying, In the tenth day of this month they shall take to them every man a lamb, according to the house of their fathers, a lamb for an house: 4 And if the household be too little for the lamb, let him and his neighbor next unto his house take it according to the number of the souls; every man according to his eating shall make your count for the lamb. 5 Your lamb shall be without blemish, a male of the first year: ye shall take it out from the sheep, or from the goats: 6 And ye shall keep it up until the fourteenth day of the same month: and the whole assembly of the congregation of Israel shall kill it in the evening. 7 And they shall take of the blood, and strike it on the two side posts and on the upper door post of the houses, wherein they shall eat it. 8 And they shall eat the flesh in that night, roast with fire, and unleavened bread; and with bitter herbs they shall eat it. 9 Eat not of it raw, nor sodden at all with water, but roast with fire; his head with his legs, and with the purtenance thereof. 10 And ye shall let nothing of it remain until the morning; and that which remaineth of it until the morning ye shall burn with fire. 11 And thus shall ye eat it; with your loins girded, your shoes on your feet, and your staff in your hand; and ye shall eat it in haste: it is the LORD's passover.

Which Passover was Nissan 14th?

Matthew 26:17-19

ALT 17 Now on the first [day] of the [Feast of] Unleavened Bread, the disciples approached Jesus saying to Him, "Where do You desire [that]we will prepare for You to eat the Passover?" 18 So He said, "Be going away into the city, to such a one, and say to him, 'The Teacher says, "My time is near; I am keeping the Passover with you [fig., in your house], with My disciples."'" 19 And the disciples did as Jesus directed them and prepared the Passover.

Luke 22:7-13

ALT 7 Then the day of the [Feast of] Unleavened Bread came, in which it was necessary [for] the Passover [or, Paschal Lamb] to be sacrificed. 8 And He sent Peter and John, saying, "Having gone, prepare the Passover for us, so that we shall eat." 9 So they said to Him, "Where do You desire [that] we will prepare [it]?" 10 Then He said to them, "Listen! When youp have entered into the city, a man carrying a pitcher of water will meet youp; follow him into the house which he enters. 11 "And youp will say to the master [or, owner] of the house, 'The Teacher says to you, "Where is the guest room, where I shall eat the Passover with My disciples?'" 12 "And that one will show to youp a large, upstairs room, having been furnished. There prepare [it]." 13 Then having gone away, they found [everything] just as He had said to them, and they prepared the Passover.

Jesus ate the passover with his twelve Jewish apostles.

Luke 22:14-20

ALT 14 And when the hour came, He reclined [to eat], and the twelve apostles with Him. 15 And He said to them, "I desired with desire [fig., I earnestly desired] to eat this Passover with youp before I suffer. 16"For I say to youp, no longer by any means shall I eat of it until which [time] it shall be fulfilled in the kingdom of God." 17 And having taken a cup, having given thanks, He said, "Take this and divide [it] among yourselves. 18 "For I say to youp, by no means shall I drink of the fruit of the grapevine until which [time] the kingdom of God comes." 19 And having taken bread, having given thanks, He broke [it] and gave [it] to them, saying, "This is My body, the [one] being given on yourp behalf p; be doing this in remembrance of Me." 20 And in the same manner [He took] the cup after [they] ate, saying, "This cup [is] the New Covenant in My blood, the [blood] being poured out on yourp behalf.

Jesus was already identified as the Lamb of God.

John 1:29

THE WORD IS THE LAMB OF ELOHIM

ECB 29 On the morrow Yahn sees Yah Shua coming to him, and words, Behold the Lamb of Elohim, who takes away the sin of the cosmos!

Only the firstborn covered by the blood of The Lamb could live. Eschaton Adam was about to become the new firstborn.

Hebrews 11:28

JMNT 28 In faith, by trust, with confident loyalty and for trustworthy allegiance, he had performed (or: has created so that it now stands as an institution) the Passover and the pouring of the blood, so that the One presently destroying (the Exterminator of) the first-born of people and animals would (or: could) not touch or come in contact with them.

Jesus covered the post and lintle of the cross with His own blood.

Exodus 12:7

YLT 7 and they have taken of the blood, and have put on the two side-posts, and on the lintel over the houses in which they eat it.

Jewish believers were to carry their crosses outside the soon-to-be-destroyed old covenant city. In the mean time the Jews would have to suffer His shame of rejection by old covenant unbelievers. The new city of God is now the true bride, which is the church. Today we don't have to suffer that shame and rejection for believing in the messiah; at least not by our own covenant people, because only believers are in the covenant now.

Hebrews 13:12-14 (Written to Jews)

ALT 12 And so Jesus, so that He should sanctify the people through [His] own blood, suffered outside the gate. 13 So let us be going out to Him outside the camp, bearing His disgrace. 14 For we do not have here a lasting city, but we are seeking the coming [one].

So why does the bible record show two Passover days?

The first sighting of the new moon began the monthly count.

Notification complications can occur while waiting for the first witnesses to see the first sliver of the new moon. They expect to get word of the first new moon sighting 30 days after the last new moon. To avoid not treating the proper day with reverence, the alleged Jews of today have made Rosh Hashanah a two day holiday. Since Nissan is the other new year, maybe they previously did the same for Passover. Due to common sighting discrepancies or even regional division over new moons, two days may have been made available for Passover.

Did Yahwey honor the Passover if it was a day off ? Hezekiah made a Passover a month late because they couldn't keep the Nissan 14th Passover. And Yahwey honored it.

2 Chronicles 30

KJV 1 And Hezekiah sent to all Israel and Judah, and wrote letters also to Ephraim and Manasseh, that they should come to the house of the LORD at Jerusalem, to keep the passover unto the LORD God of Israel. 2 For the king had taken counsel, and his princes, and all the congregation in Jerusalem, to keep the passover in the second month.3 For they could not keep it at that time, because the priests had not sanctified themselves sufficiently, neither had the people gathered themselves together to Jerusalem.

13 And there assembled at Jerusalem much people to keep the feast of unleavened bread in the second month, a very great congregation. 14 And they arose and took away the altars that were in Jerusalem, and all the altars for incense took they away, and cast them into the brook Kidron. 15 Then they killed the passover on the fourteenth day of the second month: and the priests and the Levites were ashamed, and sanctified themselves, and brought in the burnt offerings into the house of the LORD. 16 And they stood in their place after their manner, according to the law of Moses the man of God: the priests sprinkled the blood, which they received of the hand of the Levites. 17 For there were many in the congregation that were not sanctified: therefore the Levites had the charge of the killing of the passovers for every one that was not clean, to sanctify them unto the LORD.

22 And Hezekiah spake comfortably unto all the Levites that taught the good knowledge of the LORD: and they did eat throughout the feast seven days, offering peace offerings, and making confession to the LORD God of their fathers. 23 And the whole assembly took counsel to keep other seven days: and they kept other seven days with gladness. 24 For Hezekiah king of Judah did give to the congregation a thousand bullocks and seven thousand sheep; and the princes gave to the congregation a thousand bullocks and ten thousand sheep: and a great number of priests sanctified themselves. 25 And all the congregation of Judah, with the priests and the Levites, and all the congregation that came out of Israel, and the strangers that came out of the land of Israel, and that dwelt in Judah, rejoiced. 26 So there was great joy in Jerusalem: for since the time of Solomon the son of David king of Israel there was not the like in Jerusalem. 27 Then the priests the Levites arose and blessed the people: and their voice was heard, and their prayer came up to his holy dwelling place, even unto heaven.

Maybe Yeshua wanted to celebrate the last old covenant Passover with his disciples before He became the new covenant Passover; can you fault Him for that? He put eschaton Adam to death. Adam was the firstborn. Those who clung to the first-born covenant man while rejecting the blood of the lamb (applied to the post and lintel outside the old city gate) were put to death in AD 70. Eschaton Adam took their firstborn falls and covered Himself. He lives in the new covenant now.

Jews were called to deny their old self and leave their homes in Jerusalem, and take their final atonement with them. The second old covenant exodus was a call to claim the death of the firstborn; eschaton Adam; the final Passover lamb of God. They were to apply the blood to their post and leave the old covenant.

Matthew 16:25

LOSE THE SOUL TO FIND THE SOUL
ECB 25 For whoever wills to save his soul, loses it: and whoever loses his soul for my sake, finds it:

The twelve apostles took the gospel to the twelve tribes first. The commissioned diaspora gave the world the new covenant human.

Romans 6:6

JMNT 6 while constantly knowing this by intimate experience, that our old, former humanity is crucified together (or: was simultaneously and jointly impaled and put to death on an execution stake) with [Him], to the end that the body of the Sin (the body belonging to the failure; the corporal manifestation that pertains to the deviation; the group of people [Adam] who missed the target) could and would be rendered useless and inoperative (idled-down to be unproductive; made null, inactive and unemployed), for us to no longer continually be a slave to the Sin (or: perform as a slave in the failure, for the Sin, or by deviating and thus missing the goal),

Exodus 4:22-23

ECB 22 And you say to Paroh, Thus says Yah Veh: Yisra El is my son - my firstbirth: 23 and I say to you, Send my son away, that he serve me: and if you refuse to send him away, behold, I slaughter your son - your firstbirth.

Luke 14:27 (Jesus said to the Jews in Jerusalem...)

27 and whoever does not carry his post, and come after me, is not able to be my disciple.

Strong's: σταυρός

a stake or post (as set upright), i.e. (specially), a pole or cross (as an instrument of capital punishment); figuratively, exposure to death, i.e. self-denial; by implication, the atonement of Christ

Luke 24:18-27

KJV 18 And the one of them, whose name was Cleopas, answering said unto him, Art thou only a stranger in Jerusalem, and hast not known the things which are come to pass there in these days? 19 And he said unto them, What things? And they said unto him, Concerning Jesus of Nazareth, which was a prophet mighty in deed and word before God and all the people: 20 And how the chief priests and our rulers delivered him to be condemned to death, and have crucified him. 21 But we trusted that it had been he which should have redeemed Israel: and beside all this, to day is the third day since these things were done. 22Yea, and certain women also of our company made us astonished, which were early at the sepulchre; 23 And when they found not his body, they came, saying, that they had also seen a vision of angels, which said that he was alive. 24 And certain of them which were with us went to the sepulchre, and found it even so as the women had said: but him they saw not. 25 Then he said unto them, O fools, and slow of heart to believe all that the prophets have spoken: 26 Ought not Christ to have suffered these things, and to enter into his glory? 27 And beginning at Moses and all the prophets, he expounded unto them in all the scriptures the things concerning himself.

One thing is for certain, just as Jesus ate no lamb at His last old covenant passover supper, nobody sacrifices a lamb for the passover anymore. The new firstborn conquered the firstborn death through the blood of eschaton Adam. Jesus is now the born-again firstborn who can never die again. Fifty days after His resurrection, Israel was resurrected to never die again. The twelve apostles and twelve tribes quickly fulfilled their commission by taking the new covenant gospel to the animals who were already being tamed and pre-evangelized by the diaspora. Jew and Gentile were made to stand as one body of believers before AD 70 removed the old covenant harlot.