Tire mfg date code/sales

We were required to record the DOT date on the hard copy repair order and computor under the customers name when we sold a tire(s). This was done in case of a recall so the customer could be notified, whether it was mounted or sold over the counter. We would sell, but not mount any tire with a DOT date older than 5 years. Not a law but was mandated by H-D because obviously you only have two tires unless it's a trike and in either case a tire failure could be a catastrophic event. I had those Firestones that had the belt come apart on my 74 Corvette in 1980. No fun when it happens. Rubber has a shelf life and I get a kick watching people selling 50 year old NOS fan belts for $100.00.