Often when you request or select a shop, there is a range of dates available and you pick one. When the shop is assigned, you may find that the begin and end dates are the singular date that you selected, in which case you can only do it that day unless you have the option to reschedule. Sometimes when you select a date, the assigned shop shows a range of dates for the beginning and end dates. If that is the case, you can do it "early" or "late" as long as it is inside the window shown on the shop.
So the answer is "maybe".
Shopping Southeast Pennsylvania, Delaware above the canal, and South Jersey since 2008