Upon studying the Lord's day, I was surprised to find that it is only mentioned once in the entire Bible. (KJV) In Rev. 1 :10, John was taken into the future to the endtime day of the Lord and the events leading up to that great judgement day of the world. He saw all the events that were to happen just before the return of Christ for his saints and the destruction of the wicked.

I had been studying the Sabbath vs Sunday issue. It is obvious from scripture that Sunday is not the Lord's day. Sunday is always referred to as the first day of the week. There are only eight references to the first day: Matt. 28:1; Mk. 16:2, 9; Lk. 24:1; Jn. 20:1, 19; Acts 20:7; 1Cor 16:2

So what is the day of the Lord or the Lord's day? Here are just a few verses:

Joel 2:31 "The sun shall be turned into darkness, and the moon into blood, before the great and the terrible day of the LORD come.

Matt. 24:29 " Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken:

Mk. 13:24 But in those days, after that tribulation, the sun shall be darkened, and the moon shall not give her light,

Acts 2:20 The sun shall be turned into darkness, and the moon into blood, before that great and notable day of the Lord come:

Rev. 8:12 An the fourth angel sounded, and the third part of the sun was smitten, and the third part of the moon, and the third part of the stars; so as the third part of them was darkened, and the day shone not for a third part of it, and the night likewise.

Notice before the day of the Lord comes, the sun shall be dark, the moon blood and the stars shall fall. This is the same time period that John was seeing in Rev. It is judgement. It is not a day to look forward to or to celebrate. Look at the warning in Amos.

Amos 5:18-24 Woe unto you that desire the day of the LORD! to what end is it for your? the day of the LORD is darkness, and not light. As if a man did flee from a lion, and abear met him; or went into the house, and leaned his hand on the wall, and a serpent bit him. Shanll ot the day of the LORD be darkness, and not light? even very dark, and no brightness in it?
I hate, I despise your feast days, and I will not smell in your solemn assemblies. Though ye offer me burnt offerings and your meat offerings, I will not accept them: neither will I regard the peace offerings of your fat beasts. Take thou away from me the noise of thy songs; for I will not hear the melody of thy viols. But let judgement run down as waters, and righteousness as a mighty stream.

Those who look forward to their weekly Lord's day, don't know what they are desiring. Sunday is not the Lord's day, nor did he declare it the day of worship. Romainism gets the credit for that.