Don't understand your question. The fourth paragraph of your link from IRS says:
The requirements are that you must buy, or enter into a binding contract to buy, the replacement principal residence after Nov. 6, 2009, and on or before April 30, 2010, and close on the home by June 30, 2010. Additionally, you must have lived in the same principal residence for any five-consecutive-year period during the eight-year period that ended on the date the replacement home is purchased. For example, if you bought a home on Nov. 30, 2009, the eight-year period would run from Dec. 1, 2001, through Nov. 30, 2009.
taxbilly