How? The whole point of the game is to play along with the current season. If the Ravens and Steelers are playing on a Sunday you boot up Madden and play out the game that's happening.
It's a sports simulation, not a sports video game. You play it because you love the sport and you play alongside the sport.
Like MLB 2k12 has MLB Today, where you play the game as it happens in real life with the real life starting line up and pitcher. What's the point if your players don't match reality?