Use NaiveDatetime as parsing module for date-time format

README.md

@@ -17,7 +17,7 @@ Add the project to your Mix dependencies in `mix.exs`:
 ```elixir
 defp deps do
   [
-    {:ex_json_schema, "~> 0.9.0"}
+    {:ex_json_schema, "~> 0.9.1"}
   ]
 end
 ```

lib/ex_json_schema/validator/format.ex

@@ -64,9 +64,9 @@ defmodule ExJsonSchema.Validator.Format do
   defp do_validate(_, "date-time" = format, data) do
     data
     |> String.upcase()
-    |> DateTime.from_iso8601()
+    |> NaiveDateTime.from_iso8601()
     |> case do
-      {:ok, %DateTime{}, _} -> []
+      {:ok, %NaiveDateTime{}} -> []
       _ -> [%Error{error: %Error.Format{expected: format}}]
     end
   end

mix.exs

@@ -2,7 +2,7 @@ defmodule ExJsonSchema.Mixfile do
   use Mix.Project
 
   @source_url "https://github.com/jonasschmidt/ex_json_schema"
-  @version "0.9.0"
+  @version "0.9.1"
 
   def project do
     [

test/ex_json_schema/validator_test.exs

@@ -667,10 +667,14 @@ defmodule ExJsonSchema.ValidatorTest do
     assert :ok == validate(%{"format" => "date-time"}, false)
   end
 
+  test "format validation succeeds for datetime with tz offset" do
+    assert :ok == validate(%{"format" => "date-time"}, "2012-12-12 12:12:12Z")
+  end
+
   test "validation errors for date-time format" do
     assert_validation_errors(
       %{"format" => "date-time"},
-      "2012-12-12 12:12:12",
+      "2012-12-12 12:12:12-1.5",
       [{"Expected to be a valid ISO 8601 date-time.", "#"}],
       [%Error{error: %Error.Format{expected: "date-time"}, path: "#"}]
     )