Your computers clock is set to , while the RacePlanner.com server's current time is . In order to verify that cookies are enabled, Raceplanner sends a cookie with an expiration date of to your browser. However, because your system clock is more than 1 week ahead of Raceplanner's your browser does not send it back to Raceplanner. To correct this, you should set your system clock to the correct date and time.
What is a cookie? For more information on web cookies, the Wikipedia entry provides an overview.