Like all other cult-leaders running in the tradition of Herbert Armstrong the setting of dates is one of the many speculations. Always done while claiming "we are not setting any dates, but..." introducing some type of end-time scenario according to the spicing of the specific minister.
Ron Weinland says this about his mission behind his book:
"The year 2008 marked the last of God’s warnings to mankind and the beginning in a countdown of the final three and one-half years of man’s self-rule that will end by May 27, 2012.
On December 14, 2008, the First Trumpet of the Seventh Seal of the Book of Revelation sounded, which announced the beginning collapse of the economy of the United States and great destruction that will follow. The next three trumpets will result in the total collapse of the United States, and once the Fifth Trumpet sounds the world will be thrust into WW III.
The Seven Trumpets of the Seventh Seal, as well as the Seven Thunders of the Book of Revelation (which the apostle John saw but was restricted from recording) are revealed in this book.
Many of the prophecies of the Seven Thunders are being fulfilled and will continue to increase in strength and frequency throughout this final three and one-half years of man's self-rule on earth.
The prophecies revealed in this book explain the demise of the United States, Canada, Australia, New Zealand, Great Britain, and much of western Europe, which will be followed by man's final world war. This last war will be the result of clashing religions and the governments they sway. Billions will die! The destruction of this time will far exceed the very worst times of all human history.
As these events unfold, the world will increasingly become aware of the authenticity of the words in this book and realize that Ronald Weinland has been sent by God as His end-time prophet.
This book is primarily directed to the people of the three major religions of the world (Islam, Judaism and Christianity), whose roots are in the God of Abraham. Ronald Weinland has been sent to all three."
The bad part for Ron Weinland is that on May 28th 2012 all will know he WAS a false prophet.
When someone even DARES to claim he is sent by God and then utters a false date, that person is a FALSE prophet. One year eleven months and four days will pass, and then Ron Weinland will be faced with the challenge of explaining away why he was wrong - not a new thing because Armstrong also explained away the 1972 scandals and many other false prophecies.
Certainly an interesting perspective for those who are members of his group. :-)