Recently i received a email from a faithful SDA Brother in India with an article attached titled “The Great Calendar Controversy”.  The authors are eLaine Vornholt & Laura Lee Vornholt-Jones , who seem to be related, faithful Seventh-day Adventists living in Oregon.  

The very short summary of the article is that they believe the calendar was changed in the past, so the 7th-day sabbath we observe now is NOT the one that God ordained.  Basically, they try to make the case that every time a new moon is observed, a new month begins, with the 1st, 8th, 15th, 22nd and maybe 29th days always being sabbaths.  So for example, according to the Gregorian calendar, sabbath may fall on Tuesday this month, Thursday next month, and Sunday the following month.  

This is very much mistaken.  The idea that the Sabbath is not every 7th day since creation is serious error.  In fact, the 7th day - sundown Friday to sundown Saturday (they also don't believe the sabbath starts at sundown) - that we keep today is the same one that Jesus kept, the same one that Moses kept, the same one that Adam kept, and the same one that God kept after creating this world.  We will keep this sabbath all thru eternity. 

Their writings below are in black color, my responses in blue, and Bible or Spirit of Prophecy quotes in my responses are red.
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It may not be immediately clear how this proves a luni-solar calendar. This is because of a change in punctuation when the Bible was translated into English.
......(showing how God started the manna on the 16th of the 2nd month)
It has not been seen that this same passage provides an insight into the construction of the luni-solar months.

Trying to show that this text proves a luni-solar calendar by changing a comma to a period is very weak evidence.
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The idea that the Jews have never lost track of the true Sabbath is as erroneous as the idea that the weekly cycle in use today is the same one since Creation.
Important Facts of Faith... (Spiritual Gifts Volume 3): The weekly cycle of seven literal days, six for labor, and the seventh for rest, which has been preserved and brought down through Bible history, originated in the great facts of the first seven days.
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(in talking about how Ellen White and the early Adventist pioneers were told by an angel when the Sabbath starts):
Had they been correct in believing that the Sabbath began at “even”, the angel would certainly have confirmed that.
Testimony For The Church, No. 1  I saw it was 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 have. I was directed back to the first rise of the Sabbath. I followed the people of God up to this time, and did not see that God 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 comes, and that light is set aside, or rejected, then comes the 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 mind 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 the servants of God must draw together, press together.
This angel is obviously talking about the Adventist pioneers being incorrect in starting the sabbath at 6pm, and  told them to change to begin at “even”.  In the Bible “even” or “evening”  can refer to a short period of time late in the daylight hours, and often means “sunset”.  In common usage today too, the term "evening" refers to a short period of time (2 or 3 hours) late in the day when the sun is setting, with the exact time of "even" being at sunset.
This is made abundantly clear in the next quote:
My Christian Experience, Views... (Spiritual Gifts Vol 2):  Accordingly we designed to visit Boston, but in the evening, at the commencement of the Sabbath, I was shown in vision that we must not go into Boston,
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If the day begins at sunset (or even) as has always been assumed, then the “ninth day of the month at even” would be the sunset following the day of the eighth.
Leviticus 23:32 “It shall be unto you a sabbath of rest, and ye shall afflict your souls: in the ninth day of the month at even, from even unto even, shall ye celebrate your sabbath.”
So we see that in the “even” of the 9th day they start to afflict their souls, and continue until even of the next day.  Thus the entire day of the 10th is a “sabbath of rest”.  This a very strange assertion by the author.  Actually, this Bible text is good proof that the calculation of the day is from “even to even”.
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This text needs to be interpreted in the way intended: the day begins in the morning with the dawning of a new day.
According to Wikipedia: The Jewish day runs from sunset (start of "the evening") to the next sunset......
The Hebrew calendar follows a seven-day weekly cycle, which runs concurrently but independently of the monthly and annual cycles.
http://en.wikipedia.org/wiki/Hebrew_calendar
This means that the monthly cycle has nothing to do with the weekly cycle, thus destroying the authors' assumption totally that the sabbath begins on the first day of every new month.
It is true that “day” has two meanings.  One is “daylight”, and one is the entire cycle including the dark period and light period.  Oddly enough, some people are now advocating a 12-hour Sabbath (daylight portion only) because of unwillingness to follow the obvious!
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If Jesus died at 3 p.m. on the sixth day of the week, the preparation day, when the Passover lamb had been slain for centuries, then that means that the angel of death did not “pass over” the houses of the Israelites on “Passover” at all. If evening starts the new day, then the angel of death passed over the Israelites at midnight on the 15th of Nisan, not truly on Nisan 14, the Passover. Only if the day starts at dawn would this make sense.
Exo 12:42  It is a night to be much observed unto the LORD for bringing them out from the land of Egypt: this is that night of the LORD to be observed of all the children of Israel in their generations.
Num 33:3  And they departed from Rameses in the first month, on the fifteenth day of the first month; on the morrow after the passover the children of Israel went out with an high hand in the sight of all the Egyptians. 
They were brought out of Egypt at night, and it was the 15th of the month.
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Dawn was when a new day started, not sunset.  Matthew 28:1 “In the end of the sabbath, as it began to dawn toward the first day of the week, came Mary Magdalene and the other Mary to see the sepulchre.”
The phrase “in the end of the sabbath” does look to show that it was STILL sabbath, but it can, and here does, mean AFTER the sabbath (ie: the sabbath was ended).  Mark 16:1  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.  John 20:1  The first day of the week cometh Mary Magdalene early, when it was yet dark, unto the sepulchre, and seeth the stone taken away from the sepulchre.  So while it was “yet dark” it was already “the first day of the week”.
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Seventh-day Adventists have always believed that the reason the Jews were so anxious to get Jesus and the thieves off the cross was because Sabbath was coming at evening. But this is not consistent with the Biblical account.

The Biblical account states that they "begged" Pilate for the body, which doesn't show exactly anything about "why", but is evidence that they were "anxious" for something.  Just after the verses which talk about that, it also comments that the ladies "rested according to the commandment".

Redemption Or The Sufferings Of Christ His Trial And Crucifixion (5RED): The Jews were unwilling that the bodies of those who had been executed should remain that night upon the cross... So, under pretext that they did not wish the sanctity of the Sabbath to be defiled by the bodies remaining upon the cross during that holy day, which was the one following the crucifixion, the leading Jews sent a request to Pilate that he would permit them to hasten the death of the victims, so that their bodies might be removed before the setting of the sun.

The Jews used the excuse of the Sabbath as the reason to get Jesus off the cross so soon.
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Because they waited until evening to even begin the process of seeking permission to take the body, taking it down, cleaning and wrapping it, etc., it took them the night hours to do their work.

This is pure supposition, without a shred of inspired evidence.  What does the Spirit of Prophecy have to say about this?

5RED: Then they saw the heavy stone rolled against the entrance of the sepulcher, and the Son of God was left at rest. The women were last at the cross, and last at the tomb of Christ. While the evening shades were gathering, Mary Magdalene and the other Marys lingered about the sacred resting-place of their Lord, shedding tears of sorrow over the fate of Him whom they loved.

Inspired words make it very, very clear that Jesus was all sealed up in the tomb BEFORE sunset.
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The belief that Jesus was crucified on Wednesday is based on one of two premises:
1. That three 24-hour time periods were required to fulfill the prophecy of Matthew 12:40: “For as Jonah 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.”
2. That Passover, the 14th of Nisan, as calculated by the luni-solar calendar fell on a Julian Wednesday in A.D. 31.

The Great Controversy Between Christ and His Angels, and Satan and His Angels (1858):
"The disciples rested on the Sabbath, sorrowing for the death of their Lord, while Jesus, the King of glory, rested in the sepulchre."

R&H #4:  But the tomb could not hold him. Three days after his crucifixion, the mighty angels of heaven parted the darkness from their track, and rolled the stone from the sepulcher.

Other Manuscripts Volume Three:  It was in God's plan that the work which Christ had engaged to do should be completed on a Friday, and that on the Sabbath He should rest in the tomb, even as the Father and Son had rested after completing Their creative work.  (Note: Other Manuscripts is not published material, so cannot be taken as Ellen White's settled position.)
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it is impossible to have a Friday crucifixion in A.D. 31.

I don't know about this.  As far as i know, there is no inspired word anywhere saying Jesus died in A.D. 31.
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The idea that there has been a continuous cycle of uninterrupted weeks ever since Creation is wrong.
Not only is there no proof at all given, but this is directly contradicting the Spirit of Prophecy, as noted above.  
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What will be its delusions but demons impersonating long dead apostles, claiming that the scriptures have been corrupted over time and that the weekly cycle has been uninterrupted since Creation?

This makes me angry.  The authors present an astounding truth that most Seventh-day Adventists do not know - that evil angels are going to impersonate long dead apostles, then mixes in this error about the weekly cycle being  changed.  In fact, what these fake apostles will say, is that the weekly cycle HAS BEEN changed!!  Vornholts, please repent, and teach only the straight truth.
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The “continuous”, or “continual” (which is the literal translation of the word “daily”), refers to the continuous weekly cycle of the pagan solar calendar. “Daily” is also defined as “continuously without interruption.” This is a perfect description of the continuous, unending cycle of weeks of the pagan Julian and papal Gregorian calendars.

False, as per SOP quotes above.
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If a person is calculating his/her 7th day Sabbath from a completely arbitrary calendar, grounded in paganism and established in perpetuity by the Papal power, is he/she not keeping a spurious sabbath?

The Sabbath we keep was founded by God and based in the great facts of the first week of Creation.  To call God's perpetual weekly 7th day Sabbath "grounded in paganism" is bordering on blasphemy.
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Babylon, that huge monolith of mystery, intrigue, deception and paganism, is precariously balanced on one little lie: that Christ was crucified on a Friday and resurrected on a Sunday.  Anyone who is willing to suspend his/her unreliable feelings and rationally consider the evidence will concur that while Jesus was indeed crucified on the sixth day of the Biblical week, His crucifixion fell on a Julian Wednesday and His resurrection occurred on a Julian Friday.

As seen above, God's messenger says Jesus was crucified on a Friday, rested in the tomb on the Sabbath, and rose on Sunday.
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When God's people do this, they gratefully obey the warning of the fourth angel:

This is a small point, but nowhere in inspired writings can you find anything about the "4th angel".  "4th angel" implies a "4th message", and there is no new "4th" message before the end.
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One scheme that God interrupted was the World Calendar Association?s campaign for a calendar change in the 1930's to 1950's. Many nations approved the plan, but the United States refused her support.
"fourteen nations approved the World Calendar."  Does "14' = "many"?http://personal.ecu.edu/mccartyr/wca_history.html
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(speaking about 1930-1950 time frame) He held back the winds of strife...

Was the most destructive war the world has ever seen - World War II - "holding back the winds of strife"?
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Whose superscription, whose name and image is on the Gregorian calendar that had its beginning with the Roman Cæsars? Whose name and image is on the clock/calendar in the sky made at Creation? Your choice will determine whether you receive the seal of God or the mark of the Beast.

Saying that we must accept the authors' conclusion or receive "the mark of the beast" is pretty strong language.
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The overwhelming weight of evidence is that IF the authors are correct, then the Bible writers and Ellen White are wrong.  Which will you believe?  

Here are a few more quotes showing that the pope changed the sabbath from the seventh to the first day of the week (thus destroying the argument that Sunday in our current calendar is not the first day of the week), that several days in history have been said by God's messenger to be the Sabbath (check for yourself if those days are always on Saturday or not), that God's people are united in the Sabbath truth, that the Waldenses kept the true Sabbath, that Friday is the day of preparation, that the Sabbath is on the day English speakers normally call "Saturday" (but is called Sabado and other Sabbath-related words in many other languages), and that God has never changed the Sabbath day since Creation,

Christian Experience and Views...(1851):  I saw that God had not changed the Sabbath for he never changes. But the Pope had changed it from the seventh to the first day of the week; for he was to change times and laws.
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Broadside #2:  At the commencement of the Holy Sabbath, (Jan. 5th, 1849,)
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Christian Experience and Views...:  Sabbath, March 24th, 1849,
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Christian Experience and Views...:  But God's people are coming into the unity of the faith, and those who observe the Sabbath of the Bible are united in their views of bible truth.
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SOP vol.4
Through ages of darkness and apostasy, there were Waldenses who denied the supremacy of Rome, who rejected image worship as idolatry, and who kept the true Sabbath.
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Testimony for the Church, Number 20:  Friday is the day of preparation.
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Important Facts of Faith...:  I was then carried back to the creation and was shown that the first week, in which God performed the work of creation in six days and rested on the seventh day, was just like every other week. The great God in his days of creation and day of rest, measured off the first cycle as a sample for successive weeks till the close of time. "These are the generations of the heavens and of the earth when they were created." God gives us the productions of his work at the close of each literal day. Each day was accounted of him a generation, because every day he generated or produced some new portion of his work. On the seventh day of the first week God rested from his work, and then blessed the day of his rest, and set it apart for the use of man. The weekly cycle of seven literal days, six for labor, and the seventh for rest, which has been preserved and brought down through Bible history, originated in the great facts of the first seven days.