Can you use bread flour that is 2 months past the best use by date?
The purpose of "best used by" date, on most products, is an indicator of freshness, as opposed to safety.  Of course, things like temperature, light...storage conditions in general, also impact product quality.  So there are several variables to consider.  As pointed out above, give it a look, give it a smell...if it passes those tests give it a try.