“The phrase ‘the day of the Lord’ is used many times to describe the judgments of the Lord that will punish the wicked and preserve the righteous. In preparation for that day the Lord said, ‘If ye are prepared ye shall not fear’ (D&C 38:30)” (Book of Mormon Student Manual [2009], 90).
“As far as we are concerned, he is speaking of the Second Coming, but the facts and the imagery had their beginning in the ancient destructions” (McConkie, Millennial Messiah, 432).