Wednesday crucifixion theory
The Wednesday Crucifixion Theory is a doctrine popularized by Herbert W. Armstrong, the founder of the Worldwide Church of God. The view was current among Seventh Day Church of God members in the 1920s. The doctrine may have been developed originally by Ethelbert W. Bullinger, a founder of the Grace Gospel movement. Bullinger was undoubtedly convinced by the promise of "three days and three NiGHTS," a literal sign of Jonah. This idea was adopted by 7th-day keepers as further refutation of the common protestant Sunday sabbath.
Bible History
In The New Testament of the King James Version of the Bible, the phrase "high day sabbath" is not referring to the weekly sabbath (7th day of the week), but it was referring to a feast day that was kept on Thursday the day after the resurrection. Now let us look carefully at the scripture and what took place. It is established that the "son of man" would be in the heart of earth as Jonah was in the belly of the whale for three days and three nights so there is no need to clarify this prophecy concerning Jesus Christ. According to Richard Nickels, a writer and historian of seventh-day keeping groups, the Wednesday idea may have been widespread in(non-Ellen White) adventism by the end of the nineteenth century (giveshare.org, various articles.)