In the case of the SR's, the mix-date on the website is the date that applies.
In the case of the permanent flavors, the amount of pre-steeping varies over time (depends on demand) - but as a general rule we try to ensure all of the liquid is pre-steeped *at least* 2 weeks. In some cases, if you are lucky to hit the end of a water-shed, you can get liquid that's been steeping 6 weeks or longer. If there are any specific questions on an individual bottle, we track batch/lot numbers internally so we can tell you the actual mix date of any liquid.