date offset fix & post response detail echo

lib/cli.ex

@@ -14,12 +14,15 @@ defmodule Jump.CLI do
   end
 
   defp fetch(args) do
-    the_end = Calendar.strftime(DateTime.utc_now(), "%Y%m%d")
+    format = &Calendar.strftime(&1, "%Y%m%d")
+
+    now = DateTime.utc_now()
+    the_end = format.(now)
     {the_end_int, ""} = Integer.parse(the_end)
 
-    start = the_end_int - args[:days]
+    start = now |> DateTime.add(-4, :day) |> format.()
 
-    Jump.fetch(args[:article], start, the_end)
+    Jump.fetch(args[:article], start, the_end_int)
   end
 
   defp calculate(items, args) do
@@ -40,11 +43,16 @@ defmodule Jump.CLI do
   end
 
   defp finish(summary) do
-    Jump.post(summary)
+    %{status: status, body: %{"data" => data}} = Jump.post(summary)
 
+    IO.puts("Summary:")
     IO.inspect(summary)
 
+    IO.puts("""
+    \nPost Response (Status #{status}):
+    #{inspect(data)}
+    """)
+
     IO.puts("done.")
   end
-
 end