How did we get so far off on the timing of the rapture?

The revealing, given an understanding to and of when the rapture might happen is to know it will be known, in God's timing. Let's continue using scripture.

Summarization. Let me add, as the outer forces, countries, nations bother themself with a two-state solution this in in itself will be seen as dividing Israel. God made it clear, Ezekiel 37:22 Israel won't be divided anymore. Zechariah 12 made it clear this is bothersome and would be a reason to confront Israel's enemies. Hence the sudden destruction. 1 Thessalonians 5:3 and Psalm 83.