Here is my take on the subject.
First of all, the vocation of the Godhead during this six 1000 years days work week is to renew sinful men and the earth to it's pristine beginning by taking away sin and then having God resting from all his labor on the seventh 1000 year day. When this one thousand year day begins there will not be a single saved person on the earth except those who are saved in the first 31/2 years of the 7 year week after the translation of the church to heaven and when it is over there will not be a single unsaved person left to populate the new earth wherein dwelleth righteousness.
2 Pe 3:8 But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day.
9 The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.
10 But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.
Joh 5:17 But Jesus answered them, My Father worketh hitherto, and I work.
We are living at this time in the transition of days. We are at the end of 6000 years of human history and the beginning of the seventh day. The Jewish days are always evening (darkness) first. The evening and the morning are such and such day.
The day of the Lord is congruent with the last 3 1/2 years of Daniel's seventieth week. It is the great tribulation when all God's enemies will perish from the earth and those who get saved in the first 3 1/2 years and endure this great tribulation to the end will be saved, as in delivered, at the coming of Christ to the earth to rule and reign for his sabbath rest over a converted world with few left in it because of the intensity of the evil in the great tribulation.
It has been a while since I have thought about it but if my memory is correct, the day of the LORD is mentioned in 17 books of the Bible and by 12 different authors. It is always in the future from any time period of all the writers in the OT and the NT. It is the beginning of the day and it is "darkness and not light." It is a day of vengeance of Jehovah on his enemies and a day of purification and restoration of his people Israel. There is nothing pleasant for the nations in this time period. It is both a time of the wrath of the LAMB and the wrath of Satan and is a showdown between good and evil. Here is an example of the theme running through the prophets;
Isa 13:6 Howl ye; for the day of the LORD is at hand; it shall come as a destruction from the Almighty.
Am 5:18 Woe unto you that desire the day of the LORD! to what end is it for you? the day of the LORD is darkness, and not light.
Zep 1:18 Neither their silver nor their gold shall be able to deliver them in the day of the LORD’S wrath; but the whole land shall be devoured by the fire of his jealousy: for he shall make even a speedy riddance of all them that dwell in the land.
The phase "day of the Lord" appears thirty times in 29 verses. The number 30 is the number God uses for maturity. John, in revelation says he was on the isle of Patmos "on the Lord's day." This is the thirtieth verse, indicating the maturity of this doctrine. And read this; Re 6:17 For the great day of his wrath is come; and who shall be able to stand?
This is in the context of the third division of Revelation, "things that shall be hereafter" the church is called into heaven in Re 4.
Now, what does all this have to do with the "trinity" doctrine of God? Much, because none of these things are true if there is no trinitarian God. Those who deny the Christian faith by denying the character of the triune God will not meet the fate described in these verses if indeed they are not true. The oneness doctrine is a false gospel.
Oh, and we are told the church are children of light. No need to worry about the darkness of that day because we are promised we will be saved, as in delivered, from it. We will come back with the rising of the SON.
1Th 5:1 But of the times and the seasons, brethren, ye have no need that I write unto you.
2 For yourselves know perfectly that the day of the Lord so cometh as a thief in the night.
3 For when they shall say, Peace and safety; then sudden destruction cometh upon them, as travail upon a woman with child; and they shall not escape.
4 But ye, brethren, are not in darkness, that that day should overtake you as a thief.
5 Ye are all the children of light, and the children of the day: we are not of the night, nor of darkness.
6 ¶ Therefore let us not sleep, as do others; but let us watch and be sober.
7 For they that sleep sleep in the night; and they that be drunken are drunken in the night.
8 But let us, who are of the day, be sober, putting on the breastplate of faith and love; and for an helmet, the hope of salvation.
9 For God hath not appointed us to wrath, but to obtain salvation (deliverance in our new bodies) by our Lord Jesus Christ,
10 Who died for us, that, whether we wake or sleep, we should live together with him.
Please pardon me if you think this post is off topic (it is at least close to being so) but I posted it to warn the anti trinitarians about what is coming. One day soon all the false gospels will be gone and truth and righteousness shall rule. The good thing; it is not too late to repent and get it right.