NET
31 The sunlight will be turned to darkness and the moon to the color of blood, before the day of the Lord comes—that great and terrible day!
Darby
31 The sun shall be changed to darkness, and the moon to blood, before the great and terrible day of Jehovah come.
KJV
31 The sun shall be turned into darkness, and the moon into blood, before the great and the terrible day of the LORD come.