Moroni Delivering the Plates on September 22nd

On September 21, 1823, the angel Moroni appeared to Joseph Smith and told him of the existence of the gold plates which would become the Book of Mormon. The next day, September 22, Joseph Smith went to the location where they were deposited, but was forbidden to take them. He was told to go back on the same day every year, and in 1827 Joseph was allowed to take the plates.

What is significant about these dates?

Moroni's annual visits occurred generally around the time of the Israelite harvest festival season. The initial visit on September 21 in 1823 coincided with that year's celebration of the Feast of Tabernacles. In 1824, September 22 was the eve of the Jewish New Year (Rosh Hashanah) and the beginning of the fall festivals. In 1825, September 22 was precisely Yom Kippur (the Day of Atonement). In 1827, when Moroni finally delivered the plates to Joseph (see Joseph Smith History 1:59), September 22 coincided exactly with Rosh Hashanah, also known as the Feast of Trumpets...

Lenet Hadley Read explained: "The Feast of Trumpets signifies the time of Israel’s final harvest; the Day of Remembrance of God’s covenants with Israel; the announcement of revelation or truth; and preparation for God’s holiest times, including the Messianic Age." Other themes include solemn admonitions and warnings, covenant making, remembrance, sacrifice, prophecy, a new beginning, and God’s involvement in history...

The coming forth of the Book of Mormon can also be seen as initiating the final harvest of souls, renewing God’s covenant with Israel, offering a new revelation of truth, and as being clearly tied to the second coming of Jesus the messianic Christ.^[1]

It is highly unlikely that these dates were a coincidence.

Notes

1. ↑ https://knowhy.bookofmormoncentral.org/knowhy/why-did-moroni-deliver-the-plates-on-september-22