11 Saying, “’I am Alpha and Omega, the first and the last, and what thou seest, write in a book, and send it unto the seven churches which are in Aisa: unto Ephesus, and unto Smyrna, and unto Pergamos, and unto Thyatira, and unto Sardis, and unto Philadelphia, and unto Laodicea.”
I do not read the ‘day of the LORD’ as being a Sunday morning worship service. The reference to this is a specific particular time that is a dispensation of time. The so called ‘old’ is filled with references to ‘in that day’, ‘on that day’, and ‘day of the LORD’. The Bible is not nearly as disjointed as so many down through the ages have tried to make it appear.