diff --git a/requirements.txt b/requirements.txt
index ab5ad39..b66d10e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,4 @@
+isodate
 jsonschema
 six
+strict_rfc3339
diff --git a/setup.cfg b/setup.cfg
index 46527b1..4a0cd0e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -23,8 +23,10 @@ python_requires = >= 2.7, != 3.0.*, != 3.1.*, != 3.2.*, != 3.3.*, != 3.4.*
 setup_requires =
     setuptools
 install_requires =
+    isodate
     jsonschema
     six
+    strict_rfc3339
 tests_require =
     mock; python_version<"3.0"
     pytest
diff --git a/tests/integration/test_validators.py b/tests/integration/test_validators.py
index 931bda1..e977235 100644
--- a/tests/integration/test_validators.py
+++ b/tests/integration/test_validators.py
@@ -1,7 +1,9 @@
 from jsonschema import ValidationError
+import mock
 import pytest
+from six import u
 
-from openapi_schema_validator import OAS30Validator
+from openapi_schema_validator import OAS30Validator, oas30_format_checker
 
 
 class TestOAS30ValidatorValidate(object):
@@ -28,3 +30,45 @@ def test_nullable(self, schema_type):
         result = validator.validate(value)
 
         assert result is None
+
+    @pytest.mark.parametrize('value', [
+        u('1989-01-02T00:00:00Z'),
+        u('2018-01-02T23:59:59Z'),
+    ])
+    @mock.patch(
+        'openapi_schema_validator._format.'
+        'DATETIME_HAS_STRICT_RFC3339', True
+    )
+    @mock.patch(
+        'openapi_schema_validator._format.'
+        'DATETIME_HAS_ISODATE', False
+    )
+    def test_string_format_datetime_strict_rfc3339(self, value):
+        schema = {"type": 'string', "format": 'date-time'}
+        validator = OAS30Validator(
+            schema, format_checker=oas30_format_checker)
+
+        result = validator.validate(value)
+
+        assert result is None
+
+    @pytest.mark.parametrize('value', [
+        u('1989-01-02T00:00:00Z'),
+        u('2018-01-02T23:59:59Z'),
+    ])
+    @mock.patch(
+        'openapi_schema_validator._format.'
+        'DATETIME_HAS_STRICT_RFC3339', False
+    )
+    @mock.patch(
+        'openapi_schema_validator._format.'
+        'DATETIME_HAS_ISODATE', True
+    )
+    def test_string_format_datetime_isodate(self, value):
+        schema = {"type": 'string', "format": 'date-time'}
+        validator = OAS30Validator(
+            schema, format_checker=oas30_format_checker)
+
+        result = validator.validate(value)
+
+        assert result is None