David Whitmer (English Wikipedia)

On this day David was "re-ordained" (according to his previous ordination by Joseph Smith on July 8, 1834) by William McLellin, Hiram Page, Jacob Whitmer, & John Whitmer. This entailed "holy priesthood," "high priests," and a "presidency" framework. See McLellin, William E. (August 1849). "Our Tour West in 1847". The Ensign of Liberty. Vol. 7, no. 1. Kirtland, Ohio. pp. 99–104. Retrieved February 17, 2021..

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There was no formal beginning. John C. Whitmer was baptized at the age of 44 on September 15, 1875, then ordained an Elder January 28, 1876 and commissioned to "go forth and preach the Gospel...organize a new church...was to be the first Elder." (Jenson, Andrew; Stevenson, Edward; Black, Joseph S. (September 26, 1888). "Historical Landmarks". Deseret News. No. 37. p. 579. Archived from the original on July 22, 2012. Retrieved February 17, 2021.)
Vogel, Dan, ed. (2003). Early Mormon Documents. Vol. 5. Signature Books. p. 63. Archived from the original on July 13, 2012. Retrieved February 17, 2021. Excerpt

Deseret News; The Return, vol. 3, no. 3, October 1892, pp. 3–5; George Sweich, "David Whitmer and the Church of Christ," Magazine of Western History, New York, vol. 14, May 1891—October 1891, p 520.

Scott H. Faulring, "The Return of Oliver Cowdery," Archived October 21, 2011, at the Wayback Machine Maxwell Institute, Provo, Utah.

Anderson, Gale Yancey (Spring 2012), "Eleven Witnesses Behold the Plates", Journal of Mormon History, 38 (2): 146–52, doi:10.2307/23292761, JSTOR 23292761, S2CID 254492716

Johnson, Liz (September 1, 2017). "A Witness becomes mayor" (PDF). Richmond News. Richmond, Missouri. p. 1. Archived from the original (PDF) on December 23, 2021. Retrieved February 17, 2021. It is believed that upon the death of Mayor John Shaw, who was shot in the chest during the robbery of the Hughes & Wasson Bank in Richmond on May 23, 1867, Whitmer became mayor to fulfill Shaw's mayoral term until Jan. 1, 1868.

Anderson, Gale Yancey (Spring 2012), "Eleven Witnesses Behold the Plates", Journal of Mormon History, 38 (2): 146–52, doi:10.2307/23292761, JSTOR 23292761, S2CID 254492716

Anderson, Gale Yancey (Spring 2012), "Eleven Witnesses Behold the Plates", Journal of Mormon History, 38 (2): 146–52, doi:10.2307/23292761, JSTOR 23292761, S2CID 254492716

Deseret News; The Return, vol. 3, no. 3, October 1892, pp. 3–5; George Sweich, "David Whitmer and the Church of Christ," Magazine of Western History, New York, vol. 14, May 1891—October 1891, p 520.

Vogel, Dan, ed. (2003). Early Mormon Documents. Vol. 5. Signature Books. p. 63. Archived from the original on July 13, 2012. Retrieved February 17, 2021. Excerpt

There was no formal beginning. John C. Whitmer was baptized at the age of 44 on September 15, 1875, then ordained an Elder January 28, 1876 and commissioned to "go forth and preach the Gospel...organize a new church...was to be the first Elder." (Jenson, Andrew; Stevenson, Edward; Black, Joseph S. (September 26, 1888). "Historical Landmarks". Deseret News. No. 37. p. 579. Archived from the original on July 22, 2012. Retrieved February 17, 2021.)

Johnson, Liz (September 1, 2017). "A Witness becomes mayor" (PDF). Richmond News. Richmond, Missouri. p. 1. Archived from the original (PDF) on December 23, 2021. Retrieved February 17, 2021. It is believed that upon the death of Mayor John Shaw, who was shot in the chest during the robbery of the Hughes & Wasson Bank in Richmond on May 23, 1867, Whitmer became mayor to fulfill Shaw's mayoral term until Jan. 1, 1868.
Scott H. Faulring, "The Return of Oliver Cowdery," Archived October 21, 2011, at the Wayback Machine Maxwell Institute, Provo, Utah.

For the date Whitmer said he left the Mormons: An Address to All Believers in Christ, p. 8.
Doctrine and Covenants, Covenant 18:27,37
A Proclamation