Fix

modules/65-extra/10-dates-and-times/lib/solution.ex

@@ -7,19 +7,23 @@ defmodule Solution do
   def shift_days(time, 0), do: time
 
   def shift_days(%Time{} = time, amount) when is_integer(amount) do
-    Time.add(time, amount * 24, :hour)
+    Time.add(time, days_to_seconds(amount) * 24, :second)
   end
 
   def shift_days(%NaiveDateTime{} = time, amount) when is_integer(amount) do
-    NaiveDateTime.add(time, amount, :day)
+    NaiveDateTime.add(time, days_to_seconds(amount), :second)
   end
 
   def shift_days(%Date{} = time, amount) when is_integer(amount) do
     Date.add(time, amount)
   end
 
   def shift_days(%DateTime{} = time, amount) when is_integer(amount) do
-    DateTime.add(time, amount, :day)
+    DateTime.add(time, days_to_seconds(amount), :second)
+  end
+
+  defp days_to_seconds(amount) do
+    amount * 24 * 60 * 60
   end
 
   # END