Make the random difference between two equivalent dates to be of the order of seconds and not days.

filters.py

@@ -28,7 +28,7 @@ def sort_cards(cards):
     # cards on the same date.
 
     dates = [
-        dp.parse(card["date"]) + datetime.timedelta(rand(0, 10000))
+        dp.parse(card["date"]) + datetime.timedelta(seconds=rand(0, 10000))
         for card in cards
     ]