I know why the date of the second of the month is said by one of the visionaries of Medjugorje to be important. Basically, the first part of the tribulation ends with a certain timing, and the second of the month of April will be the first full day afterward, the first full day of peace, holiness, rebuilding after an horrific series of unimaginable sufferings, year after year.
So that date will become a new type of Thanksgiving, a worldwide celebration. For a while, it might be a monthly celebration on the second of every month. Then after a while, it will be once a year on April 2nd.
The first part of the tribulation begins with the four horsemen of the apocalypse, which are the same as the first four Seals of the Seven Seals:
1. World War 3,
2. severe worldwide civil unrest,
3. famine more severe in wealthy nations,
4. death and the fear of death
Then the fifth Seal is a great martyrdom of Christians in the occupied lands after WW3.
The six Seal is an all-out nuclear war. Two or more nuclear weapons will be used in World War 3. But many nuclear missiles will be used in World War 4, which is the sixth Seal.
After or near the end of World War 4, many holy persons throughout the world will be given the Seal of the living God. This is a visible sign on the forehead, along with interior gifts from God. The sign and the gifts differ from one person to another.
Then the seventh Seal is divided into events called Seven Trumpets, only six of which occur for the present generation. The Trumpets:
1. pieces of a broken comet strike the Earth (comet Tempel 1). A third of the land is burned up, including whole cities.
2. one large piece of the same comet strikes the ocean. A third of the fish and a third of the ships are destroyed.
3. nuclear fallout from World War 4 falls to earth, some more radiation is stirred up by the comet strikes as well, causing many deaths.
4. nuclear winter caused by World War 4 and especially by the fires and debris from the comet strikes
5. A supernatural affliction which causes great suffering in all those who do not have the Seal. The affliction lasts 153 days from November 8th, 2038 to April 9th, 2039. Those who do not have the Seal may pray the Rosary for some relief.
6. The Three Days of Darkness, March 29, 30, 31 in 2040 A.D. Previously, about a third of humanity was killed by the past events of the tribulation. Now another third of humanity is killed by the Three Days of Darkness.
On April 1st of 2040, the people who survived came out of their homes and other places to see that the earth has been healed of the nuclear fallout and nuclear winter. The first part of the tribulation has ended.
On the second of April, the first full day after the first part of the tribulation, the people proclaim a day of thanksgiving and rejoicing. This continues monthly, and later yearly.