* Gustave has correctly cited EGW's statement. She did believe that Christ was crucified in the Spring of 31 AD.
* The 33 AD date that Gustave proposes has been a popular date that goes back to the 13th century and was proposed by Roger Bacon. It is a date often found in the margins of the KJV Bibles.
* This 33 AD date is based in part upon the assumption that the Jewish calendar of the 1st century AD was exactly the same as the revised version that has come to us today.
* As I understand it, this assumption has some conflicts with what we know about the a needed coordination with a Babylonian cycle at that time and also with the Elephantine papyri.
* An AD 30 date has been popular among some Christians today. However, this date would not have had a Friday Passover with a Nisan date in April.
* Gustave has some support for his proposed Nisan date in 31 AD. But, it is not conclusive, in my opinion.
* A major problem is that actually a date can not be conclusively established by either astronomical or calendrical data.
* One of the issues is that we can not be positive as to the exact boundaries of the lunar calendar system used by the 1st century Jews.
* Some SDAs will consider their understanding of the prophecy of the 2300 days to be a factor to be considered in the date of the crucifixion. This is circular reasoning. Further, in my opinion, this view is based upon one understanding of the 2300 days when in actual fact that 2300 day prophecy may allow for some additional understandings. IOW, I am not going to tie the "midst of the week" to a rigid, concrete specified number of days. If I were to say that I will telephone you in the middle of next week, that might mean Tuesday, Wednesday or Thursday. It would not be limited to Wednesday.
* The bottom line, in my opinion is: The exact date for the crucifixion can not be determined with certainty. All proposed dates are based upon some assumptions/conjectures. This is not an issue of salvation. No important Biblical doctrine is based upon a determination of the exact date for the crucifixion of Christ.
NOTE: This is an exceedingly complex issue. There is much that can be said that I have not posted due to space limitations.