There is only one evening on the 14th.... and that is at the ending of the 13th.. Leviticus pretty clear for both days to be important to our Creator...
could it be that the 14th was only to be celebrated in the evening and then the next full day of 15th, the feast of unleavened bread? (starting at the end of the 14th )was a full holy Sabbath day? All leaven didn’t need to be out of the house until the 15th correct? There would then be a full 12 hours (daylight) on 14th to remove all the leaven..
The biggest problem folks have in understanding the chronology is....of course the mistranslations of major works like the King James...etc.
The Hebrew word "evening" does not describe the night time. It describes the afternoon. The translators were not aware of this because the word "ereb" (evening, even) is defined.....as the sun going down.
To the Hebrew ignorant King James people this meant....sunset or dusk. But simply ask yourself a question......(thinking like a Hebrew). When does the sun go down? We need to also ask.....when does the sun go up?
The sun starts going up at sunrise and stops going up at noon. Conversely....the sun begins going down at noon and finishes this movement as it descends below the horizon at sunset. This entire period of time (noon to sunset/Hebrew "ereb") is called the evening. The plural "ereb" is "arabayim".....designating at least two! The King James people were confused about this and that's why many different translations will say "dusk; sunset; evening; twilight...etc". They just did not understand that the entire afternoon period to the Hebrews was called "Evening" and each side of "Evening" had an "Even"....one at noon and the other at sunset.
“kill it in the evening–that is, the interval between the sun’s beginning to P.M. decline, and sunset, corresponding to our three o’clock in the afternoon.” (Jamieson, Fausset, Brown Commentary, Exodus 12:6)
Think about it for a while. When did they kill your savior? Was it at the ninth hour [Matthew 27:45-50][Mark 15:33-37][Luke 23:44-46]? Was the ninth hour actually 3:00 P.M.? Sure it was! The Hebrews only had watches during the darkness [Matthew 14:25][Mark 6:48][Luke 12:38]. They began counting the hours at sunrise......so the ninth hour would have been around three P.M.