For Jews, A day begins in the evening and ends he next afternoon.
Yes, that's the proper way to timeline a day in this context (from sunset to sunset). Now apply this knowledge to the Bible passages that you keep quoting but yet keep changing instead of accepting them for what they actually say.
So, the day of preparation would be in the morning/afternoon with Passover starting that evening - it would all be the same day based on how we do things today.
Sort of, but you're still getting it wrong below because you didn't quite word it properly here. The day of preparation starts on the 14th of Nisan at 6pm and ends at 5:59pm (technically, from sunset to sunset). What you are calling the "Passover meal" (the Last Supper) happened a while after 6pm on the 14th of Nisan, BEFORE Jesus died at about 3pm on the same 14th of Nisan. There is also a "Passover meal" (as referenced in Exodus 12) which happens AFTER the day of preparation (after 6pm on the 15th of Nisan).
So, it would be impossible for Jesus to die at noon on the Day of Preparation and have still eaten the Passover meal with the disciples.
You're still making the same mistakes over and over again. You still refuse to learn. However, I continue these responses for the sake of other onlookers who actually wish to learn about the subject matter.
Jesus did NOT die at noon on that day (the 14th of Nisan). He died at about 3pm that day. You also continue to conflate "the Passover meal" (the lamb and bitter herbs and etc., eaten on the 15th of Nisan) with the "Last Supper meal" that Jesus ate with his disciples on the 14th of Nisan. These are SEPARATE meals.
Please read through Exodus 12 before responding to me again. Exodus 12 specifically outlines the details (the law) regarding the Passover and the Festival of Unleavened Bread (aka what Mark and John are referring to in the Bible verses that you are quoting but trying to change). To understand the day references that are made in Mark and John, you
must FIRST read through and understand the history that is recorded in Exodus 12.
In Exodus 12, the "first month of the year" is the month of Nisan (originally called Abib, as is referenced in Exodus 13). You will discover that the 14th of Nisan is the "day of preparation" before the high sabbath Passover meal at the beginning of the 15th of Nisan. IOW, the lamb is slaughtered towards the end of the 14th of Nisan, and the lamb is eaten (along with bitter herbs, etc) towards the beginning of the 15th of Nisan. IOW, this is all happening at "twilight" (the bit of light remaining at the end of the 14th, before sunset, and at the beginning of the 15th, after sunset).
Also, please read through John 1 (specifically John 1:29 for the "lamb of God" reference) to familiarize yourself as to who Jesus is. After reading through both Exodus 12 and John 1, you will be able to put together the Biblical truth that Jesus is the ultimate "lamb of God" that is being sacrificed on the 14th of Nisan, in accordance with the Exodus 12 account's timing of the sacrificing of the unblemished lambs. The Bible, as a whole, connects together like that.