When was Jesus Crucified?

It is important to note that in Biblical time, each day began from evening to evening (Genesis 1).

I believe it was in the morning of the 14th of Nisan (the first month).
And the 15th of Nisan of that year, the first day of the Feast of Unleavened Bread, by the supreme plan of the Most High, falls on a Sabbath, thus making it a special Sabbath (Greek text "megas", John 19:31), or a high day for the first day of the Feast of Unleavened Bread must be kept as a holy convocation (Leviticus 23:6).

The Last Supper was held during the beginning (first evening, late evening) of the 14th of Nisan and the sacrifice of the Lamb was at the end (second evening, early evening) of the same day. Which is when (Exodus 12:18) they must begin to observe the unleavened bread for seven days. That is, the Last Supper was held on a Thursday night, if we have already considered the following day to be Friday, the sixth day. The Feast of the unleavened bread began the 15th, which is the first day of such feast to be kept as holy convocation, while the eating of the unleavened bread has begun since the 14th(Exodus 12:18).
Please note that the actual first kill of the passover (Exodus 12) happened at the end (second evening) of the 14th of Nisan (Exodus 12:6-31). So, the beginning evening of the 14th, was the first day of the unleavened bread, while the first day of the Feast (Hebrew: khag khawg, Leviticus 23:6) of the Unleavened Bread began on the 15th, which is to be a holy convocation. Matthew and Mark both mentioned the partake of the Last Supper at the first day of the unleavened bread, NOT the first day of the FEAST of Unleavened Bread (Matthew 26:17, Mark 14:12). And John affirmed that the crucifixion happened on the Preparation Day of the Passover (John 19:14), therefore, the first evening of the 14th day of the first month (Nisan/Abib) was the time of the Last Supper, then Jesus' captive at midnight of that same day, and at third hour (Mark 15:25, around 9am), his crucifixion in the morning of the same day and died sometime just after the ninth hour (Matthew 27:46, Mark 15:34, Luke 23:44 after around 3pm) the second evening and ending the 14th day of the first month. This understanding of first and second evenings of each day is natural due to the concept of biblical
day.

As for the three day and three night prophecy, I would count from the day Jesus was crucified in the "heart" of the Earth (Matthew 12:40), which is the middle of the East and the West, the center of important breakthroughs of the world, and most important of all, the beginning time of God's Judgement on Him, which was prior to the time darkness came, when the Father has forsaken Christ (Matthew 27:45), around 12pm, hence the first day and darkness(night), and after the darkness, the second day and the second night followed by the 15th day, the third day, then the third night leading to the 16th, the day of resurrection. 14th[[[First day, First night(the darkness), Second day]]] --> 15th[[[Second night, Third day]]] ---> 16th[[[Third night]]].

Therefore, the day of crucifixion fits well on the fifth day of the week. There is no need to consider the fourth day of the week just because there could be two sabbaths as first of all,
the sabbath of that week is the special sabbath because it was just after the passover (John 19:14) and therefore the meeting time of two holy convocations(John 19:31); Secondly, the holy convocation of the Feast of the Unleavened Bread was not mentioned as Sabbath in contrast with the sabbath-rest on the first day of the seventh month (Leviticus 23:24). And as far as work is concerned, preparation and purchasing of spices by the women need not be an issue whether by management of time around the Sabbath or by definition of regular work in the words of the Lord of the Sabbath.

There are no conflicts in the Bible, only the errors of human judgement upon paradoxes found in the Bible. It is only the Lord's will to reveal what is to be revealed to us, as for the hidden things, we can never discover on our own.

Update 12/29/2021:
Here's the chart for it: