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a time-traveler who needed to know what year they landed in, and the automated date on the receipt for the cheapest item from the nearest shop was the quickest solution (as opposed to asking someone and raising suspicion)
after being told that the gum was only bought because it was the cheapest item i thought “ok so what info is even on a receipt” and they usually have a date/time. clocks are everywhere but calendars arent so a timetraveler whos trying to not ask strange questions made sense to me