Throughout the course of the Book of Mormon, the Nephites used three different points of reference for measuring time with their calendars:
Reference Point
When Used
Scripture Block
From the time when Lehi left Jerusalem
600–92 B.C.
1 Nephi 1–Mosiah 29
From the time when the government changed from kings to judges
92 B.C.–A.D. 1
Mosiah 29–3 Nephi 1
From the time of the sign of the birth of Jesus Christ
A.D. 1–421
3 Nephi 1–Moroni 10
Note: The sign was given at Jesus’s birth. However, they did not start using it as a point of reference until A.D. 9.