I believe the Day of the Lord begins at the pre tribulation rapture, coming like a thief in the night, which is a wedding reference, alluding to the pre tribulation rapture in that symbolic language.

1 Thessalonians 5:2 For you yourselves know well that the day of the Lord will come like a thief in the night.
See the weddingstudy for more on this topic.

The subject of verse 5 is the rapture.
[1 Thessalonians 4:17] Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so
shall we ever be with the Lord.
[1 Thessalonians 4:18] Therefore comfort one another with these words.

A Jewish day begins at sunset, dusk.
Likewise, the Day of the Lord will begin at dark, when the light of Christians are removed.  The Day of the Lord is darkness.

Amos 5:18 Woe to you who desire the day of the LORD! Why would you have the day of the LORD? It is darkness, and not light;

This is the reason why Christians are raptured prior to the pre trib, we lights, and we will not enter into that darkness of the tribulation, when our lamps are burning bright like the 5 wise virgins of Matt 25:1-13.

Continuing on in 1 Thess 5.

[1Thess 5:4] But ye, brethren, are not in darkness, that that day should overtake you as a thief.
[1Thess 5:5] Ye are all the children of light, and the children of the day: we are not of the night, nor of darkness.
[1Thess 5:6] Therefore let us not sleep, as do others; but let us watch and be sober.

I believe the Day of the Lord is 1000 years.

2 Peter 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.

I believe that the judgment day is 1000 years, with resurrections at the beginning and end of the day.

Revelation 20:5 But the rest of the dead lived not again until the thousand years were finished. This is the first resurrection.

I believe that this resurrection of "the rest of the dead" is the ressurrection to judgment of John 5, which speaks of two resurrections, one of "they that hear" and one in which "all that are in the graves".

25 Verily, verily, I say unto you, The hour is coming, and now is, when the dead shall hear the voice of the Son of God: and they that hear shall live.
26 For as the Father hath life in himself; so hath he given to the Son to have life in himself;
27 And hath given him authority to execute judgment also, because he is the Son of man.
28 Marvel not at this: for the hour is coming, in the which all that are in the graves shall hear his voice,
29 And shall come forth; they that have done good, unto the resurrection of life; and they that have done evil, unto the resurrection of damnation.

RSV:
John 5:29 and come forth, those who have done good, to the resurrection of life, and those who have done evil, to the resurrection of judgment.

Two resurrections:

Acts 24:15  And have hope toward God, which they themselves also allow, that there shall be a resurrection of the dead, both of the just and unjust.

In one Day (of 1000 years according to both Peter and Rev.)

Of both the just "at the last day.": (start of the 1000 years in Rev. 20:4)

John 6:39  And this is the Father's will which hath sent me, that of all which he hath given me I should lose nothing, but should raise it up again at the last day.

John 6:40  And this is the will of him that sent me, that every one which seeth the Son, and believeth on him, may have everlasting life: and I will raise him up at the last day.

And the unjust "at the last day.": (end of the 1000 years in Rev. 20:4)

John 12:48  He that rejecteth me, and receiveth not my words, hath one that judgeth him: the word that I have spoken, the same shall judge him in the last day.

For more study on the Day of the Lord, I suggest Eddie Chumney's most excellent website:
http://www.geocities.com/Heartland/2175/heb_root.html#BrideOfChrist

At the bottom of the page, see
Lesson #15 - God's Prophetic Timetable: The Day of the Lord (Sabbath) - Part I
Lesson #16 - God's Prophetic Timetable: The Day of the Lord (Sabbath) - Part II

Below, was copied from  Part II

Some of the titles of the Day of the Lord indicating wrath/darkness are:

             1.  A day of punishment (Visitation) (Isaiah 10:3, Hosea 9:7, Jeremiah 46:21, 50:27)
             2.  A day of fierce anger (Isaiah 13:13, Lam 1:12)
             3.  The day of grief and desperate sorrow (Isaiah 14:3)
             4.  The day of trouble (Isaiah 22:5, Ezekiel 7:7, Zephaniah 1:14-15, Jeremiah 51:2, Nahum 1:7, Hab. 3:16, Psalms 50:15, 91:15,
107:6,13,19,28)
             5.  The day of the great slaughter (Isaiah 30:25)
             6.  The day of the Lord's vengeance (Isaiah 34:8, 61:2, 63:4)
             7.  The day of slaughter (Jeremiah 12:3)
             8.  The day of affliction (Jeremiah 16:19)
             9.  The day of evil (Jeremiah 17:17,18, Amos 6:3, Proverbs 16:4)
           10.  The day of destruction (Job 21:30)
           11.  The day of their calamity (Jeremiah 18:17, 46:21, Deuteronomy 32:35)
           12.  The day of His anger (Lam. 2:1,21,22, Zephaniah 2:2,3)
           13.  The day of His wrath (Ezekiel 7:19, Job 20:28, 21:30, Psalms 110:5, Proverbs 11:4, Zephaniah 1:15,18, Romans 2:5, Revelation
6:17)
           14.  The day of your fall (Ezekiel 32:10)
           15.  The day of recompense (Hosea 9:7)
           16.  The day of darkness and gloominess (Joel 2:1,2, Zephaniah 1:14-15)
           17.  The day of clouds and thick darkness (Joel 2:1,2, Zephaniah 1:14-15)
           18.  The great and terrible day of the Lord (Joel 2:31, Malachi 4:5)
           19.  The day of battle (Job 38:23, Psalms 140:7, Prov 21:31, Amos 1:14, Zech. 14:3)
           20.  The day of Jacob's trouble (Jeremiah 30:7, Daniel 12:1)
                   ---> 2/3 will not make it through the tribulation, 1/3 will (Zechariah 13:8-9)
           21.  A day of devastation and desolution (Zephaniah 1:15)
           22.  A day of trumpet and alarm (Zephaniah 1:16)
           23.  The day of judgment (Matt 10:15, 12:36, Mark 6:11, II Pet 2:9, I John 4:17, Jude 6)            24.  The day of judgment and perdition of
ungodly men (II Peter 3:7)
           25.  The great and notable day of the Lord (Acts 2:20)

The Day of the Lord is also described as a time of peace, prosperity, and tranquility or light.

           Some of the these titles are:

             1.  A day the Lord gives you rest (Isaiah 14:3, Hebrews 4:4,7-9)
             2.  The day of the EAST wind (Isaiah 27:8)
             3.  The day of salvation (Isaiah 49:8)
             4.  The day we have waited for (Lam. 2:16)
             5.  A day of clouds (clouds refer to believers) - (Ezekiel 30:3, Hebrews 12:1)
             6.  The day that I am glorified (Ezekiel 39:13)
             7.  The day of His preparation (Nahum 2:3)
             8.  The day of His coming (Malachi 3:2)
             9.  The day when the Son of Man is revealed (Luke 17:30)
           10.  The day of Lord Jesus (I Corinthians 1:8, II Corinthians 1:14, Philippians 1:6)
           11.  The day of redemption (Ephesians 4:30)
           12.  The day of Christ (Philippians 1:10, 2:16)
           13.  The day of God (II Peter 3:12)
           14.  The day of the gladness of His heart (Song of Solomon 3:11)

           Below is a description of the condition of the earth during this time:

             1.  A time of peace and tranquility on the earth (Isaiah 11:6-9)
             2.  The animals will be at peace, the farmland prosperous (Isaiah 11:6-7, 65:25, Ezekiel 34:25-28, Hosea 2:18, Leviticus 26:6)
             3.  The whole world will have a knowledge of God (Isaiah 11:9, Hebrews 2:14, Jeremiah 31:33-34, Isaiah 2:2-3, Micah 4:1-2)
             4.  There will be peace and no wars (Isaiah 2:3, Micah 4:3)
             5.  Yeshua/Jesus will be king over all the earth (Zechariah 14:9, Daniel 7:13-14,18,27, Revelation 2:27, 11:15, 12:5, 19:15-16)
             6.  There will be continual light on the earth (Zechariah 14:6-8, Revelation 22:5)

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or on the subject of the pretribulation rapture,
or if you wish to share any scriptures with me.