The Antichrist has not confirmed a seven-year peace deal that divides Israel. All that must come to pass before Armageddon and the world continues on after that, especially with a 1000-year reign of Christ. Greece may fail on Oct 21 (or any other day) but what Camping predicts is absolutely false.
The peace treaty will not necessarily be announced as a 7 year peace treaty. It could be, for example, 20 years. It is a period of 7 years on God’s calendar. He knows.