D&C 45

Of the righteous, the Savior said -

"...it shall come to pass that he that feareth me shall be looking forth for the great day of the Lord to come, even for the signs of the coming of the Son of Man.
40 And they shall see signs and wonders, for they shall be shown forth in the heavens above, and in the earth beneath."  (Doctrine and Covenants | Section 45:39 - 40)

If find it interesting that it will be the righteous that recognize the signs of His coming.  The Savior then notes -

"...they shall behold blood, and fire, and vapors of smoke.
42 And before the day of the Lord shall come, the sun shall be darkened, and the moon be turned into blood, and the stars fall from heaven.
43 And the remnant shall be gathered unto this place..."  (Doctrine and Covenants | Section 45:41 - 43)

Obviously referring to the revelation of Joel of the sun, moon, and stars.  In recognizing the signs of His coming, President Gordon B. Hinckley said in 2001 -

“The era in which we live is the fulness of times spoken of in the scriptures, when God has brought together all of the elements of previous dispensations. From the day that He and His Beloved Son manifested themselves to the boy Joseph, there has been a tremendous cascade of enlightenment poured out upon the world. The hearts of men have turned to their fathers in fulfillment of the words of Malachi. The vision of Joel has been fulfilled wherein he declared: Joel 2:28-32." (October General Conference, 2001)