The Seventh Day Adventist church is formally…
May 1863 CE
For about 20 years, the Adventist movement has consisted of a small, loosely knit group of people who come from many churches and whose primary means of connection and interaction is through James White's periodical The Advent Review and Sabbath Herald.
They embrace the doctrines of the Sabbath, the heavenly sanctuary interpretation of Daniel 8:14, conditional immortality, and the expectation of Christ's premillennial return.
Among its most prominent figures are Joseph Bates, James White, and Ellen G. White.
The Seventh-day Adventist Church is the largest of several Adventist groups which have arisen from the Millerite movement of the 1840s in upstate New York, a phase of the Second Great Awakening.
William Miller had predicted on the basis of Daniel 8:14–16 and the "day-year principle" that Jesus Christ would return to Earth between the spring of 1843 and the spring of 1844.
In the summer of 1844, Millerites came to believe that Jesus would return on October 22, 1844, understood to be the biblical Day of Atonement for that year.
Miller's failed prediction has become known as the "Great Disappointment".
Hiram Edson and other Millerites have come to believe that Miller's calculations were correct, but that his interpretation of Daniel 8:14 was flawed as he assumed Christ would come to cleanse the world.
These Adventists have come to the conviction that Daniel 8:14 foretells Christ's entrance into the Most Holy Place of the heavenly sanctuary rather than his Second Coming.
Over the past few decades this understanding of a sanctuary in heaven has developed into the doctrine of the investigative judgment, an eschatological process that commenced in 1844, in which every person will be judged to verify their eligibility for salvation and God's justice will be confirmed before the universe.
This group of Adventists continues to believe that Christ's Second Coming will continue to be imminent, however they resist setting further dates for the event, citing Revelation 10:6, "that there should be time no longer."