Handle dates in the Unix timestamp format (Fixes #763)

lib/pleroma/web/common_api/utils.ex

@@ -240,8 +240,23 @@ def format_asctime(date) do
     Strftime.strftime!(date, "%a %b %d %H:%M:%S %z %Y")
   end
 
+  def date_to_asctime(date) when is_float(date) do
+    date
+    |> trunc()
+    |> date_to_asctime()
+  end
+
+  def date_to_asctime(date) when is_integer(date) do
+    with {:ok, date} <- DateTime.from_unix(date) do
+      format_asctime(date)
+    else
+      _e ->
+        ""
+    end
+  end
+
   def date_to_asctime(date) do
-    with {:ok, date, _offset} <- date |> DateTime.from_iso8601() do
+    with {:ok, date, _offset} <- DateTime.from_iso8601(date) do
       format_asctime(date)
     else
       _e ->

test/web/common_api/common_api_utils_test.exs

@@ -153,4 +153,41 @@ test "returns an existing mapping for an existing object" do
       assert conversation_id == object.id
     end
   end
+
+  describe "formats date to asctime" do
+    test "when date is an integer Unix timestamp" do
+      date = DateTime.utc_now() |> DateTime.to_unix()
+
+      expected =
+        date
+        |> DateTime.from_unix!()
+        |> Calendar.Strftime.strftime!("%a %b %d %H:%M:%S %z %Y")
+
+      assert Utils.date_to_asctime(date) == expected
+    end
+
+    test "when date is a float Unix timestamp" do
+      date = 1_553_808_404.602961
+
+      expected =
+        date
+        |> trunc()
+        |> DateTime.from_unix!()
+        |> Calendar.Strftime.strftime!("%a %b %d %H:%M:%S %z %Y")
+
+      assert Utils.date_to_asctime(date) == expected
+    end
+
+    test "when date is in ISO 8601 format" do
+      date = DateTime.utc_now() |> DateTime.to_iso8601()
+
+      expected =
+        date
+        |> DateTime.from_iso8601()
+        |> elem(1)
+        |> Calendar.Strftime.strftime!("%a %b %d %H:%M:%S %z %Y")
+
+      assert Utils.date_to_asctime(date) == expected
+    end
+  end
 end