D.P.
Hi Michelle,
Here's what I always do, when in doubt, I smell the food, if it smells funky pitch it. If not it's o.k. to cook or re-heat. However, I wouldn't keep anything beyond 2 wks.in the frig.(unless it was frozen).
That simple test has worked for me since I started cooking 54 yrs ago. I've never gotten sick.
All the best,
D. P