Firstly, accept this as the fulfillment of 2 Thess. 2:6, the necessary revealing "in his own time", the period of 1,290 days of Daniel 12:11.
Then one can see the Day of the Lord (cf. Malachi 4:5) as coming soon, viz., May 8, 2016 A.D.
With all due respect, Daniel 11:20 was fulfilled the week that the king of Daniel 11:19 died back on Tuesday, March 30, 2000 A.D., having been fatally shot by the king of Daniel 11:20.
Daniel 11:40 was fulfilled on November 8, 2012 A.D. within the foretold time of the end, it was the 58th day into the count.
As for what to expect, the Day of the Lord is great and dreadful, but as to Daniel 12:12, we are assured that it is a blessing to wait and come unto that 1,335th Day.
"Eye has not seen, nor ear heard, nor have entered into the heart of man, the things which God has prepared for those who love Him." (1 Cor. 2:9)
For a broader picture, this is a view looking back from the First Sunday of Pentecost of the Judgment, with analysis :
Daniel 12:12 : "Blessed is he who waiteth and cometh unto 1,335 days."
The Judgment will begin on Great and Holy Friday, March 25, 2016 A.D. That the world will be embroiled in nuclear/meteorological/volcanic chastisement and God's people in need of "the shortening of days", it can be seen that the Three Days of Darkness will also occur during this Holy Week.
The First Resurrection Sunday of the Judgement is March 27, 2016 A.D.
Judgment Sundays of Easter follow :
of Divine Mercy on April 3, 2016 A.D.
3rd Easter Sunday on April 10, 2016 A.D.
4th on April 17, 2016 A.D.
5th on April 24, 2016 A.D.
6th on May 1, 2016 A.D.
That Christ should return on a Feast of Pentecost is indicative of the same Real Presence of the Son as found in The Very Eucharist He has imparted to us. That such a Feast is also of the Father, from Whom proceeds the Holy Spirit, such a Manifestation of the Blessed Trinity shall also include all those who shall have been drawn to Him, both the dead and the living.
The date for the First Pentecost Sunday of the Judgment can be ascertained from other prophecies.
Christ was hailed as King on Palm Sunday, and prophecy has it that His disciples would be hated by all, scoffing at all such allusions to Kingship. As to Christ coming with great power and glory then (Matt. 24:30), this aspect of Christ's life should be the reckoning of the 1,335th day, for He is our King, forever, now, and always. Then can be seen the power and glory proper beginning the week prior (Ascension Sunday / 7th Sunday of Easter) to that specific Sunday of Pentecost.
Concerning the world being turned into the hands of the antichrist there is the 16th century prophecy concerning the rule left to two (from the rule previous to having been by three). After 3 years and 7 months those two would go to war, leaving none. That formally is the beginning of the time of the antichrist wreaking havoc. That exact date is necessarily 1,335 days before the Sunday before that specific Sunday of Pentecost.
Knowing of the inability of the third to rule can give us a specific day when the time period of 3 years and 7 months ends. Due to complications sustained in an automobile accident on Monday, February 9, 2009 A.D., the third finally succumbed on Thursday, March 19, 2009 A.D. This is a window to calculate such a day that would begin the 3 years and 7 months. I had visited him on February 14, 2009 A.D., the Saturday after the collision. It was reported that he had spoken somewhat at length on the previous Thursday, February 12, 2009 A.D., but he was not right, speaking incoherently. This is the day of the beginning of the rule left to two for 3 years and 7 months. This would necessarily bring the end of those 3 years and 7 months to Tuesday, September 11, 2012 A.D.
Thus begins the 1,335 days on Wednesday, September 12, 2012 A.D. This also begins the 1,290 day period of the formal end of the daily sacrifice as found in Daniel 12:11. This abomination of desolation (no rule) continues until the 1,291st day, which is Great and Holy Friday, March 25, 2016 A.D., also the Feast of the Annunciation. This day marks the Judgment in Christ's return as Messiah (Great Messiah).
The 1,335th day is then Sunday, May 8, 2016 A.D, the specific Sunday of Pentecost being May 15, 2016 A.D. Both are Sundays of the Judgment.