In order to know how far we are on the Biblical calendar we have connect our modern Gregorian Calendar to the Anno Hominis Calendar we use on this site.
In order to make this important connection, we have to build the structure:
“Now in the fifteenth year of the reign of Tiberius Caesar, Pontius Pilate being governor of Judaea, and Herod being tetrarch of Galilee, and his brother Philip tetrarch of Ituraea and of the region of Trachonitis, and Lysanias the tetrarch of Abilene,”
Luke 3:1 (KJB)
Historians assume that this must be in the timeframe between 26-36 AD, which we can safely assume to be correct timeframe which we will narrow down further in the next steps.
We know that Jesus was dead for 3 days and 3 nights:
“For as Jonas was three days and three nights in the whale's belly; so shall the Son of man be three days and three nights in the heart of the earth.”
Matthew 12:40 (KJB)
We know that every new day in the Bible starts at 6PM, so around sundown.
We know that Jesus died at the Jewish 9th hour:
“And about the ninth hour Jesus cried with a loud voice, saying, Eli, Eli, lama sabachthani? that is to say, My God, my God, why hast thou forsaken me?”
Matthew 27:46 (KJB)
which was the Roman 3rd hour, which is our 3PM.
We know that the women visiting the grave where going there after Sabbath, so after our Saturday on the next morning, so this is Sunday:
“And when the sabbath was past, Mary Magdalene, and Mary the mother of James, and Salome, had bought sweet spices, that they might come and anoint him. And very early in the morning the first day of the week, they came unto the sepulchre at the rising of the sun.”
Mark 16:1-2 (KJB)
According the Law of Moses, the women could not go to the grave to perform the balming, so they had to wait until the day after Sabbath.
However, because the new day started at sundown (on our Saturday evening), it would have been dangerous to travel and unpractical to perform the balming.
Therefore they went on the Sunday morning.
If we then count back, Jesus must have died on a Wednesday!
We know that Jesus died at passover:
“And his disciples went forth, and came into the city, and found as he had said unto them: and they made ready the passover. And in the evening he cometh with the twelve. And as they sat and did eat, Jesus said, Verily I say unto you, One of you which eateth with me shall betray me. And they began to be sorrowful, and to say unto him one by one, Is it I? and another said, Is it I?”
Mark 14:16-19 (KJB)
Remember that the day starts in the evening, which is our Tuesday.
He dies on the Wednesday, which was still passover.
We know that Passover was in the month Nisan according Leviticus:
“In the fourteenth day of the first month at even is the LORD'S passover.”
Leviticus 23:5 (KJB)
So Jesus died on Nissan 14.
We also should note that the day after was called 'High Sabbath':
“The Jews therefore, because it was the preparation, that the bodies should not remain upon the cross on the sabbath day, (for that sabbath day was an high day,) besought Pilate that their legs might be broken, and that they might be taken away.”
John 19:31 (KJB)
This is confirmed in Leviticus 23: 5-7:
“In the fourteenth day of the first month at even is the LORD'S passover. And on the fifteenth day of the same month is the feast of unleavened bread unto the LORD: seven days ye must eat unleavened bread. In the first day ye shall have an holy convocation: ye shall do no servile work therein.”
Leviticus 23:5-7 (KJB)
This is the confusion as to why many think that Jesus died on a Friday (Good Friday), thinking He died the day before the weekly Sabbath.
People who believe this will come up with the year 33, as that was the year where Nisan 14 fell on a Friday.
We now can determine on which year Nissan 14 fell on a Wednesday in the timeframe between 26 and 36 AD, by using a converter as can be found here.
We find 2 years where 14 Nissan was on a Wednesday: the year 27 and the year 30.
The year 27 would be too early as at that time John the Baptist is still alive according various sources like Wikipedia.
Therefore we come to the conclusion that Jesus died on 3 April 30, which was 14 Nisan 3996 AH.
We use this reference point in the full calendar.
Please remember that the year '0' in our modern day calendar doesn't exist.