经文：第一要知道，在末后的日子，必有好讥诮的人，带着讥诮而来，随从自己的私欲而行，并说，主来临的应许在那里？因为从列祖睡了以来，万物依然存在，如同从创造之初一样。（彼后三3-4，另译）
主的日子就是旧约中耶和华的日子。在玛拉基书四章五节是耶和华大而可畏的日子。主的日子对旧约或今日的犹太人和不信的人是大灾难、神审判的日子。旧约中主的日子，主要是用以说到神行政对付的审判。
我们若透彻的研读旧约和新约，就会看见主的日子若不算千年国的一千年，可能不超过七年。那就是但以理九章二十四至二十七节里所说到七十个七的末七主要的部分。前六十九个七，四百八十三年的期间，结束于主耶稣被钉十字架，祂这弥赛亚被“剪除”的时候。现今在第六十九个七和第七十个七开头之间有一段间隔。圣经没有告诉我们这间隔会有多久。但我们确知在这间隔以后，会有七年的期间，就是第七十个七，那是在千年国以前。主的来临会在这些年间发生。
在彼后三章四节好讥诮的人说，“主来临的应许在那里？”来临，希腊文，parousia，巴路西亚，意同在。照着新约，主的来临不会仅仅持续一小时或一天，乃要持续一段时期。藉着详细研读圣经，我们已看见，主的巴路西亚可能会开始于第七十个七的中间，就是在千年国以前末后七年的中间。不但如此，主的巴路西亚可能开始于主离开三层天上神的宝座，并且包着云彩降到空中（启十）的时候。这就是说，主的巴路西亚要发生于今世末了三年半的期间。
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The Day of the Lord – Mal. 4:15, 2 Pet. 3:3-4
The day of the Lord is the day of Jehovah in the Old Testament. In Malachi 4:5 it is the great and awsome day of the Lord. For the Jews and unbelievers in the Old Testament or today, the day of the Lord is a day of great tribulation and God’s judgment. While in the Old Testament, the day of the Lord is mainly used to speak of the judgment of God’s administrative dealings.
If we have a thorough study of both the Old and New Testaments, we shall see that the day of the Lord will probably last about seven years. It is nearly the same as the last week of the seventy weeks spoken of in Daniel 9:24-27. The first sixty-nine weeks, a period of four hundred eighty-three years, ended when the Lord Jesus was crucified, when he, the Messiah, was “cut off”. There is now a gap between the sixty-ninth week and the beginning of the seventieth week. We are not told in the Bible how long this interval will be. But we do know that after this interval, there will be a period of seven years, which will be the seventieth week, before the millennium. The coming of the Lord will take place during these years.
In 3:4 the mockers said, “Where is the promise of his coming?” The Greek word for “coming” is parousia, which literally means presence. According to the New Testament, the Lord’s parousia, his coming, will not last merely an hour or a day. Rather, it will last for a period of time. Through detailed study of the Scriptures we have come to see that the Lord’s parousia will probably begin at the middle of the seventieth week, that is, in the middle of the last seven years before the millennium. Furthermore, it will probably begin from the time the Lord leaves the throne of God in the third heaven and descends to the air wrapped in a cloud (Rev. 10). This means that the Lord’s parousia will take place during the last three and a half years of this age.