An untold number of people have tried to predict the Lord's return by using elaborate time tables. Most date setters do not realize mankind has not kept an unwavering record of time. Anyone wanting to chart for example 100 BC to 2000 AD would have contend with the fact 46 BC was 445 days long, there was no year 0 BC, and in 1582 we switched from Julian Years (360 days) to Gregorian (365 days). Because most prognosticators are not aware of all these errors, from the get go their math is already off by several years.
People throughout history have read the same words of Jesus and have come up with different interpretations of what He intended. They've somehow managed to get around all restrictions against precise date setting. On a number of occasions, by doing so, they created pure havoc.
well.. they will be exposed. It will be interesting to read about their explanation a day later as to why it didn't happen.
Sadly, this type of falsehood hurts the church.