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.
Read all the failed prophecies: