Does cooking a meat that's about to expire lengthen how long it's "good" for?

So like, if have a meat that has a particular "use by" date, and I cook it - I will kill a lot of the bacteria. Then if I refrigerate reasonably fast, will it last longer than it would've if I just left it alone? Are the two times I passed it through the Danger Zone negligible in comparison to how much bacteria I've killed?