I've just checked the date on the bag of flour I use the other day to make a cheese sauce. It's August 2009. The sauce was fine and I've got no worries about continuing to use the flour. (If that bag gets forgotten about at the back of the cupboard, and I rediscover it in a few years time, I'd still have no problems with using it).
Further, I note that the date is 'best before' and not 'use by'. That means that there's no risk to health from exceeding the date but there could be a (almost wholly theoretical) risk of the quality degrading after that date.
Use your floor, Ric.ror. It can't harm you and I'd be amazed if you could tell that it wasn't bought today.
Chris