What does a Shelf Life Date say
A Self Life Date is a date at which the producer gives the guarantee that the product retains the right quality and taste until that time. After that this will gradually decrease, but this is so slow that you can use the products a few months after this date. After covering the minimum shelf life date, the products can be used for at least another 3 to 4 months. There are even cases known where the products were still fine to use after 2 years.
See here also an article published on NOS.nl about the use and meaning of a SLD date in food.