Sister, I think God has prepared the Seventh-day Adventist church to understand this message by having established in our church a clear definition of what the word "evening" means, which is the first part of the next part of understanding "when it is" that evening falls on the first day. Jesus had no need to change the Sabbath earlier because the faithful needed to live near the stand-in Earthly temple-copy where the Sabbath is right in Jerusalem, but nowhere else. Now that Christians are spread throughout the world because of the true temple in heaven, it is necessary to better understand the Sabbath in the new covenant book of Hebrews. Our church has never changed "when it is" that evening takes place since Joshua. Our church still assumes the human tradition since Joshua that the first "evening" took place at the beginning of the first day, when it takes place in the middle of the first day.
I saw that it is even so: “From even unto even, shall ye celebrate your Sabbath.” Said the angel: “Take the word of God, read it, understand, and ye cannot err. Read carefully, and ye shall there find what even is, and when it is.” I asked the angel if the frown of God had been upon His people for commencing the Sabbath as they had. I was directed back to the first rise of the Sabbath, and followed the people of God up to this time, but did not see that the Lord was displeased, or frowned upon them. I inquired why it had been thus, that at this late day we must change the time of commencing the Sabbath. Said the angel: “Ye shall understand, but not yet, not yet.” Said the angel: “If light come, and that light is set aside or rejected, then comes condemnation and the frown of God; but before the light comes, there is no sin, for there is no light for them to reject.” I saw that it was in the minds of some that the Lord had shown that the Sabbath commenced at six o'clock, when I had only seen that it commenced at “even,” and it was inferred that even was at six. I saw that the servants of God must draw together, press together. (Testimonies for the Church, vol. 1, Page 116)
When our prophetess received the above message, the church had understood the first part: "what even is", but not the second part: "when it is". They still assume to this day the human tradition since Joshua that the first "evening" took place at the beginning of the first day, when I know it took place in the middle of the first day. The first day is from first light to light again in the morning or from morning to morning, except for the special case of the first day, which did not start on a standard morning because it was an instantaneous change and not a gradual transition from dark to light to make it a standard morning as it is for subsequent days.
And God said, “Let there be light,” and there was light. And God saw that the light was good. And God separated the light from the darkness. God called the light Day, and the darkness he called Night. And there was evening and there was morning, the first day. (Genesis 1:3-5 ESV)
Our church must understand that you cannot have an "evening" without light first, because it is the gradual transition from light to dark. It is not the same from evening-to-morning above as evening-to-evening below, when the former is half the time of the latter. Above, a day is from first light to morning light, just as below a Sabbath is from evening to evening, making the first full day start as it ends from morning to morning, except for the special case of the first day where there was no gradual transition from dark to light, but an instantaneous change, unlike the first "evening" in the middle of the first day which made a gradual transition from light to dark.
It shall be to you a Sabbath of solemn rest, and you shall afflict yourselves. On the ninth day of the month beginning at evening, from evening to evening shall you keep your Sabbath.” (Leviticus 23:32 ESV)
United in our hope for the soon return of Jesus, Jorge