@whatsmyname - I agree with the majority of the posters here: If you open the can and the sauce looks or smells bad, don't use it; otherwise, you should be fine. As noted, the acidity of canned tomato products can sometimes prevent them from being good for as far past the marked date as other canned goods, but they should still be fine for a few extra months.
And I can add input based on my own recent experience—last summer, I couldn't find the tomato sauce I liked at my local grocery store for a few weeks, and they told me it was being discontinued and marked the remaining cans down to half price. I was surprised and sad, so I bought a whole bunch of it with an expiration date of last October. Well, it turns out that the company was just tweaking the label format and the sauce returned to the shelves just after the beginning of the year, which is great. And I am still working my way through my stockpile of that October sauce with no issues at all.
Hope everything goes well with your chili! 