The English word Rapture does not occur AT ALL in the King James, New King James, NIV, or other modern translation of the Bible. In fact, the word itself did not come into existence until around the very late 1500s A.D. Among many Christians, especially those in certain parts of the Protestant world, the meaning of the rapture is a snatching up to heaven of true Christians who are still alive at some time just before or during the Great Tribulation.
Many believers rest their hope in what they believe is a "rapture" of saints based on only two Bible verses written by the Apostle Paul (1Thessalonians 4:16 - 17).
Many religious teachers teach that the rapture (also known as 'rapture of the church') can only occur just before Jesus' Second Coming to reign and rule the earth for 1,000 years. Some also believe that such "snatching up" of saints will occur in SECRET to save a select few from the suffering and trials delineated in the book of Revelation. These believers, as taught, are taken to heaven for a period until they return triumphantly with Jesus to fight those who are deceived by Satan after which they will rule the world with Christ.
Jesus told his disciples, in regard to the exact time of his return to earth and the establishment of his kingdom, that "(the) day and hour no one knows - neither the angels in heaven, nor the Son - except the Father only . . ." (Matthew 24:36, HCSB).
In spite of these direct statements from Jesus, there have been those throughout history who have dogmatically tried to predict the day of the rapture and / or the day of Jesus' return to earth. Religious leaders foolish enough to "set dates" have been embarrassed and discredited when their predicted date quietly comes and goes.
A notable example of "setting dates" for events like the rapture occurred with William Miller, a preacher in the Baptist church, who predicted Jesus would come back to earth sometime within a year of March 21, 1843. When March 21, 1844 came and went without incident, Miller adopted the new date of April 18, 1844 for Christ's return. When THAT date failed, one of Miller's associates recalculated the date of the Second Coming to be October 22, 1844. What is labeled "The Great Disappointment" occurred on that October day when Jesus did not arrive as scheduled.
The lesson of history is that believers TODAY need to be VERY wary of any teacher or preacher who says he or she knows the date of the 'rapture' and Jesus' second coming.