Typically, most companies adhere to the same date labeling practices except where required by local or regional requirements - working in the food industry, that's almost definitely August.
Moreover, products for sale in the US which are labeled as "Best Before" aren't unsafe to eat after the date listed - "BB" just has to do with the quality declining beyond what the manufacturer deems to be reasonable. So if you go call the company hotline on August 2, they're going to politely tell you to buzz off because it tastes funky. That's not to say that the product would be edible indefinitely, but that's the extent of the product shelf life based on the ingredients, process, packaging, and storage conditions. Given that it's mayo, eventually it's going to spoil in the packaging, but even if that date was January, as long as it wasn't funky or separated I'd expect you'd be perfectly fine to consume it for some time.
Conversely, if it's labeled as "Sell By" or "Use By", those dates do have to do with the safety of consumption (at least under reasonable consumption conditions). Like "BB", the "Use By" date listed isn't some magical threshold where the product is instantly bad, instead it's the amount of time lapsed where the manufacturer expects a significant number of products will have begun to spoil.