World Bible Society – September 11-13, 1988
Edgar Whisenant, a former engineer with the National Aeronautics and Space Administration, released a widely-read pamphlet predicting that the end would come during Rosh Hashanah 1988, which fell between September 11 and 13 of that year.
Whisenant claimed that there were "88 reasons" to justify the date he picked, with the World Bible Society publishing 3.2 million copies of his pamphlet, including 200,000 that went to pastors.
"When the September prediction failed, Whisenant updated the time to October 3. Now that date, too, has fallen through," noted the Christian Research Institute in a 1988 essay.
"Our task is not to dwell at length on the particulars of the end-times, but to make ourselves ready at all times, and to help others become ready for Christ's return, which will happen in His time."