Day of the Lord is one year long. It occurs immediately after the 7, years.
2 Peter 3:10
Evening of 10/2, becoming 10/3, elect are changed in a moment supernaturally protected. Then one year later evening of 10/2. becoming 10/3, Jesus comes to Mount of Olives and elements melt with fervent heat, and new heavens and new earth.
“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.”