Notice "fourteenth day" in Exodus 12:6. Compare with "God called the light Day" (Genesis 1:5) This is the daylight of the fourteenth. Then at the end of Exodus 12:6 you have "between the evenings," which is defined in Deuteronomy 16:6 as "at even, at the going down of the sun."

Deu 16:6 But at the place which the LORD thy God shall choose to place his name in, there thou shalt sacrifice the passover at even, at the going down of the sun, at the season that thou camest forth out of Egypt.

Then you "shall eat the flesh in that night" (Exodus 12:8). That is the night that follows the fourteenth day.  Finally, you have the mention of morning: "that which remaineth of it until the morning ye shall burn with fire" (Exodus 12:10). Note that burning with fire is a work activity, as is cooking, commanded after the Passover. You have one 24 hour day's worth of related activity. From the morning when the lamb is prepared for the sacrifice until the last of its bones are burned before dawn you have a complete day's activity.

With Y'shua we have another account of a Passover (Preparation Day). Y'shua was condemned to death in the morning, at the beginning of the fourteenth. He was hung on the cross and died late in the afternoon. Joseph came at evening (sundown) to Pilate to initiate the burial process (Mat 27:57). Y'shua was buried well after sundown (Joh 19:39). Burial was work. Remember the large stone rolled into place (Mat 27:60, compare Joshua 10:27). Burial was completed before dawn (Luk 23:54 "And that day was the preparation, and the sabbath drew on.").

Mat 27:57 When the even was come, there came a rich man of Arimathaea, named Joseph, who also himself was Jesus' disciple:
Mat 27:58 He went to Pilate, and begged the body of Jesus. Then Pilate commanded the body to be delivered.
Mat 27:59 And when Joseph had taken the body, he wrapped it in a clean linen cloth,
Mat 27:60 And laid it in his own new tomb, which he had hewn out in the rock: and he rolled a great stone to the door of the sepulchre, and departed.

Joh 19:38 And after this Joseph of Arimathaea, being a disciple of Jesus, but secretly for fear of the Jews, besought Pilate that he might take away the body of Jesus: and Pilate gave [him] leave. He came therefore, and took the body of Jesus.
Joh 19:39 And there came also Nicodemus, which at the first came to Jesus by night, and brought a mixture of myrrh and aloes, about an hundred pound [weight].
Joh 19:40 Then took they the body of Jesus, and wound it in linen clothes with the spices, as the manner of the Jews is to bury.
Joh 19:41 Now in the place where he was crucified there was a garden; and in the garden a new sepulchre, wherein was never man yet laid.
Joh 19:42 There laid they Jesus therefore because of the Jews' preparation [day]; for the sepulchre was nigh at hand.

In summary, we have, in both cases, a sequence of 1. day, 2. evening (dusk), 3. night, 4. morning (dawn) just as we see in Genesis.  I understand that dawn is part of the new day; the beginning of dawn is both the end of one 24 hr day and the beginning of the next.

Gen 1:5 (ASV) And God called the light Day, and the darkness he called Night. And there was evening and there was morning, one day.