Is it bottles or cans? Either way, the date is kind of redundant. It was never required in the past. Some have mentioned prescription medicine, that is labeled for potency because if it is not stored right (away from heat and light) it may deteriorate. I have read that most drugs are OK even 3 years past that date. There are some exceptions, like Vitamin C or sunblock which really do deteriorate quickly.
When I first saw your post I thought remove the ends, flatten out the cans and make jewelry out of them. I guess you are wondering if it is ok to drink, it is. I have seen the BBQ recipes too, Dr. Pepper adds the sweetness and tenderizes the meat.