[permalink id=330]According to most, all regular Bag-In-Box Syrups generally have a "best buy" date. However, that date is really more of a suggestion. After the "best buy" date has passed, it is more than likely that the taste may begin to suffer, especially as the best buy date gets older. That being said, the syrups are still more than likely good to use.
The exception to this rule is diet syrups. Those generally have a shorter shelf-life due to using other sweeteners and chemical preservatives.
Search "Syrup Expiration Dates" or "Bag In Box Syrup Best Buy Date" to see other sites mentioning/answering this question: