diff --git a/docker/models/configs.py b/docker/models/configs.py
index 3588c8b5..5ef13778 100644
--- a/docker/models/configs.py
+++ b/docker/models/configs.py
@@ -30,6 +30,7 @@ class ConfigCollection(Collection):
 
     def create(self, **kwargs):
         obj = self.client.api.create_config(**kwargs)
+        obj.setdefault("Spec", {})["Name"] = kwargs.get("name")
         return self.prepare_model(obj)
     create.__doc__ = APIClient.create_config.__doc__
 
diff --git a/docker/utils/build.py b/docker/utils/build.py
index a5c4b0c2..86a4423f 100644
--- a/docker/utils/build.py
+++ b/docker/utils/build.py
@@ -10,8 +10,9 @@ from ..constants import IS_WINDOWS_PLATFORM
 
 _SEP = re.compile('/|\\\\') if IS_WINDOWS_PLATFORM else re.compile('/')
 _TAG = re.compile(
-    r"^[a-z0-9]+((\.|_|__|-+)[a-z0-9]+)*(\/[a-z0-9]+((\.|_|__|-+)[a-z0-9]+)*)*" \
-        + "(:[a-zA-Z0-9_][a-zA-Z0-9._-]{0,127})?$"
+    r"^[a-z0-9]+((\.|_|__|-+)[a-z0-9]+)*"
+    r"(?::[0-9]+)?(/[a-z0-9]+((\.|_|__|-+)[a-z0-9]+)*)*"
+    r"(:[a-zA-Z0-9_][a-zA-Z0-9._-]{0,127})?$"
 )
 
 
diff --git a/docker/utils/utils.py b/docker/utils/utils.py
index 759ddd2f..dbd51303 100644
--- a/docker/utils/utils.py
+++ b/docker/utils/utils.py
@@ -5,7 +5,7 @@ import os
 import os.path
 import shlex
 import string
-from datetime import datetime
+from datetime import datetime, timezone
 from packaging.version import Version
 
 from .. import errors
@@ -394,8 +394,8 @@ def convert_filters(filters):
 
 
 def datetime_to_timestamp(dt):
-    """Convert a UTC datetime to a Unix timestamp"""
-    delta = dt - datetime.utcfromtimestamp(0)
+    """Convert a datetime to a Unix timestamp"""
+    delta = dt.astimezone(timezone.utc) - datetime(1970, 1, 1, tzinfo=timezone.utc)
     return delta.seconds + delta.days * 24 * 3600
 
 

diff --git a/tests/unit/fake_api.py b/tests/unit/fake_api.py
index 0524becd..03e53cc6 100644
--- a/tests/unit/fake_api.py
+++ b/tests/unit/fake_api.py
@@ -19,6 +19,8 @@ FAKE_VOLUME_NAME = 'perfectcherryblossom'
 FAKE_NODE_ID = '24ifsmvkjbyhk'
 FAKE_SECRET_ID = 'epdyrw4tsi03xy3deu8g8ly6o'
 FAKE_SECRET_NAME = 'super_secret'
+FAKE_CONFIG_ID = 'sekvs771242jfdjnvfuds8232'
+FAKE_CONFIG_NAME = 'super_config'
 
 # Each method is prefixed with HTTP method (get, post...)
 # for clarity and readability
@@ -512,6 +514,11 @@ def post_fake_secret():
     response = {'ID': FAKE_SECRET_ID}
     return status_code, response
 
+def post_fake_config():
+    status_code = 200
+    response = {'ID': FAKE_CONFIG_ID}
+    return status_code, response
+
 
 # Maps real api url to fake response callback
 prefix = 'http+docker://localhost'
@@ -630,4 +637,6 @@ fake_responses = {
     post_fake_network_disconnect,
     f'{prefix}/{CURRENT_VERSION}/secrets/create':
     post_fake_secret,
+    f'{prefix}/{CURRENT_VERSION}/configs/create':
+    post_fake_config,
 }
diff --git a/tests/unit/fake_api_client.py b/tests/unit/fake_api_client.py
index 95cf63b4..79799421 100644
--- a/tests/unit/fake_api_client.py
+++ b/tests/unit/fake_api_client.py
@@ -37,6 +37,7 @@ def make_fake_api_client(overrides=None):
         'create_host_config.side_effect': api_client.create_host_config,
         'create_network.return_value': fake_api.post_fake_network()[1],
         'create_secret.return_value': fake_api.post_fake_secret()[1],
+        'create_config.return_value': fake_api.post_fake_config()[1],
         'exec_create.return_value': fake_api.post_fake_exec_create()[1],
         'exec_start.return_value': fake_api.post_fake_exec_start()[1],
         'images.return_value': fake_api.get_fake_images()[1],
diff --git a/tests/unit/models_configs_test.py b/tests/unit/models_configs_test.py
new file mode 100644
index 00000000..6960397f
--- /dev/null
+++ b/tests/unit/models_configs_test.py
@@ -0,0 +1,10 @@
+import unittest
+
+from .fake_api_client import make_fake_client
+from .fake_api import FAKE_CONFIG_NAME
+
+class CreateConfigsTest(unittest.TestCase):
+    def test_create_config(self):
+        client = make_fake_client()
+        config = client.configs.create(name="super_config", data="config")
+        assert config.__repr__() == "<Config: '{}'>".format(FAKE_CONFIG_NAME)
diff --git a/tests/unit/utils_build_test.py b/tests/unit/utils_build_test.py
index fa7d833d..5f1bb1ec 100644
--- a/tests/unit/utils_build_test.py
+++ b/tests/unit/utils_build_test.py
@@ -6,11 +6,10 @@ import tarfile
 import tempfile
 import unittest
 
+import pytest
 
 from docker.constants import IS_WINDOWS_PLATFORM
-from docker.utils import exclude_paths, tar
-
-import pytest
+from docker.utils import exclude_paths, tar, match_tag
 
 from ..helpers import make_tree
 
@@ -489,3 +488,51 @@ class TarTest(unittest.TestCase):
                 assert member in names
             assert 'a/c/b' in names
             assert 'a/c/b/utils.py' not in names
+
+
+# selected test cases from https://github.com/distribution/reference/blob/8507c7fcf0da9f570540c958ea7b972c30eeaeca/reference_test.go#L13-L328
+@pytest.mark.parametrize("tag,expected", [
+    ("test_com", True),
+    ("test.com:tag", True),
+    # N.B. this implicitly means "docker.io/library/test.com:5000"
+    # i.e. the `5000` is a tag, not a port here!
+    ("test.com:5000", True),
+    ("test.com/repo:tag", True),
+    ("test:5000/repo", True),
+    ("test:5000/repo:tag", True),
+    ("test:5000/repo", True),
+    ("", False),
+    (":justtag", False),
+    ("Uppercase:tag", False),
+    ("test:5000/Uppercase/lowercase:tag", False),
+    ("lowercase:Uppercase", True),
+    # length limits not enforced
+    pytest.param("a/"*128 + "a:tag", False, marks=pytest.mark.xfail),
+    ("a/"*127 + "a:tag-puts-this-over-max", True),
+    ("aa/asdf$$^/aa", False),
+    ("sub-dom1.foo.com/bar/baz/quux", True),
+    ("sub-dom1.foo.com/bar/baz/quux:some-long-tag", True),
+    ("b.gcr.io/test.example.com/my-app:test.example.com", True),
+    ("xn--n3h.com/myimage:xn--n3h.com", True),
+    ("foo_bar.com:8080", True),
+    ("foo/foo_bar.com:8080", True),
+    ("192.168.1.1", True),
+    ("192.168.1.1:tag", True),
+    ("192.168.1.1:5000", True),
+    ("192.168.1.1/repo", True),
+    ("192.168.1.1:5000/repo", True),
+    ("192.168.1.1:5000/repo:5050", True),
+    # regex does not properly handle ipv6
+    pytest.param("[2001:db8::1]", False, marks=pytest.mark.xfail),
+    ("[2001:db8::1]:5000", False),
+    pytest.param("[2001:db8::1]/repo", True, marks=pytest.mark.xfail),
+    pytest.param("[2001:db8:1:2:3:4:5:6]/repo:tag", True, marks=pytest.mark.xfail),
+    pytest.param("[2001:db8::1]:5000/repo", True, marks=pytest.mark.xfail),
+    pytest.param("[2001:db8::1]:5000/repo:tag", True, marks=pytest.mark.xfail),
+    pytest.param("[2001:db8::]:5000/repo", True, marks=pytest.mark.xfail),
+    pytest.param("[::1]:5000/repo", True, marks=pytest.mark.xfail),
+    ("[fe80::1%eth0]:5000/repo", False),
+    ("[fe80::1%@invalidzone]:5000/repo", False),
+])
+def test_match_tag(tag: str, expected: bool):
+    assert match_tag(tag) == expected

Can't create config object
Much like https://github.com/docker/docker-py/issues/2025 the config model is failing to create a new object due to 'name' KeyError

```
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "docker\models\configs.py", line 10, in __repr__
    return f"<{self.__class__.__name__}: '{self.name}'>"
  File "docker\models\configs.py", line 14, in name
    return self.attrs['Spec']['Name']
```

This https://github.com/docker/docker-py/pull/2793 appears to be the fix that was implemented and should likely be implements for configs as well (if not other models that might have this issue)
tests/unit/models_configs_test.py::CreateConfigsTest::test_create_config tests/unit/utils_build_test.py::test_match_tag[test:5000/repo-True0] tests/unit/utils_build_test.py::test_match_tag[test:5000/repo:tag-True] tests/unit/utils_build_test.py::test_match_tag[test:5000/repo-True1] tests/unit/utils_build_test.py::test_match_tag[192.168.1.1:5000/repo-True] tests/unit/utils_build_test.py::test_match_tag[192.168.1.1:5000/repo:5050-True]
tests/unit/utils_build_test.py::ExcludePathsTest::test_directory tests/unit/utils_build_test.py::ExcludePathsTest::test_directory_with_single_exception tests/unit/utils_build_test.py::ExcludePathsTest::test_directory_with_subdir_exception tests/unit/utils_build_test.py::ExcludePathsTest::test_directory_with_trailing_slash tests/unit/utils_build_test.py::ExcludePathsTest::test_directory_with_wildcard_exception tests/unit/utils_build_test.py::ExcludePathsTest::test_double_wildcard tests/unit/utils_build_test.py::ExcludePathsTest::test_double_wildcard_with_exception tests/unit/utils_build_test.py::ExcludePathsTest::test_exclude_custom_dockerfile tests/unit/utils_build_test.py::ExcludePathsTest::test_exclude_dockerfile_child tests/unit/utils_build_test.py::ExcludePathsTest::test_exclude_dockerfile_dockerignore tests/unit/utils_build_test.py::ExcludePathsTest::test_exclude_include_absolute_path tests/unit/utils_build_test.py::ExcludePathsTest::test_include_wildcard tests/unit/utils_build_test.py::ExcludePathsTest::test_last_line_precedence tests/unit/utils_build_test.py::ExcludePathsTest::test_no_dupes tests/unit/utils_build_test.py::ExcludePathsTest::test_no_excludes tests/unit/utils_build_test.py::ExcludePathsTest::test_parent_directory tests/unit/utils_build_test.py::ExcludePathsTest::test_question_mark tests/unit/utils_build_test.py::ExcludePathsTest::test_single_and_double_wildcard tests/unit/utils_build_test.py::ExcludePathsTest::test_single_filename tests/unit/utils_build_test.py::ExcludePathsTest::test_single_filename_leading_dot_slash tests/unit/utils_build_test.py::ExcludePathsTest::test_single_filename_trailing_slash tests/unit/utils_build_test.py::ExcludePathsTest::test_single_subdir_single_filename tests/unit/utils_build_test.py::ExcludePathsTest::test_single_subdir_single_filename_leading_slash tests/unit/utils_build_test.py::ExcludePathsTest::test_single_subdir_wildcard_filename tests/unit/utils_build_test.py::ExcludePathsTest::test_single_subdir_with_path_traversal tests/unit/utils_build_test.py::ExcludePathsTest::test_subdirectory tests/unit/utils_build_test.py::ExcludePathsTest::test_trailing_double_wildcard tests/unit/utils_build_test.py::ExcludePathsTest::test_wildcard_exclude tests/unit/utils_build_test.py::ExcludePathsTest::test_wildcard_filename_end tests/unit/utils_build_test.py::ExcludePathsTest::test_wildcard_filename_start tests/unit/utils_build_test.py::ExcludePathsTest::test_wildcard_subdir_single_filename tests/unit/utils_build_test.py::ExcludePathsTest::test_wildcard_subdir_wildcard_filename tests/unit/utils_build_test.py::ExcludePathsTest::test_wildcard_with_exception tests/unit/utils_build_test.py::ExcludePathsTest::test_wildcard_with_wildcard_exception tests/unit/utils_build_test.py::TarTest::test_tar_directory_link tests/unit/utils_build_test.py::TarTest::test_tar_socket_file tests/unit/utils_build_test.py::TarTest::test_tar_with_broken_symlinks tests/unit/utils_build_test.py::TarTest::test_tar_with_directory_symlinks tests/unit/utils_build_test.py::TarTest::test_tar_with_empty_directory tests/unit/utils_build_test.py::TarTest::test_tar_with_excludes tests/unit/utils_build_test.py::TarTest::test_tar_with_file_symlinks tests/unit/utils_build_test.py::test_match_tag[test_com-True] tests/unit/utils_build_test.py::test_match_tag[test.com:tag-True] tests/unit/utils_build_test.py::test_match_tag[test.com:5000-True] tests/unit/utils_build_test.py::test_match_tag[test.com/repo:tag-True] tests/unit/utils_build_test.py::test_match_tag[-False] tests/unit/utils_build_test.py::test_match_tag[:justtag-False] tests/unit/utils_build_test.py::test_match_tag[Uppercase:tag-False] tests/unit/utils_build_test.py::test_match_tag[test:5000/Uppercase/lowercase:tag-False] tests/unit/utils_build_test.py::test_match_tag[lowercase:Uppercase-True] tests/unit/utils_build_test.py::test_match_tag[a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a:tag-puts-this-over-max-True] tests/unit/utils_build_test.py::test_match_tag[aa/asdf$$^/aa-False] tests/unit/utils_build_test.py::test_match_tag[sub-dom1.foo.com/bar/baz/quux-True] tests/unit/utils_build_test.py::test_match_tag[sub-dom1.foo.com/bar/baz/quux:some-long-tag-True] tests/unit/utils_build_test.py::test_match_tag[b.gcr.io/test.example.com/my-app:test.example.com-True] tests/unit/utils_build_test.py::test_match_tag[xn--n3h.com/myimage:xn--n3h.com-True] tests/unit/utils_build_test.py::test_match_tag[foo_bar.com:8080-True] tests/unit/utils_build_test.py::test_match_tag[foo/foo_bar.com:8080-True] tests/unit/utils_build_test.py::test_match_tag[192.168.1.1-True] tests/unit/utils_build_test.py::test_match_tag[192.168.1.1:tag-True] tests/unit/utils_build_test.py::test_match_tag[192.168.1.1:5000-True] tests/unit/utils_build_test.py::test_match_tag[192.168.1.1/repo-True] tests/unit/utils_build_test.py::test_match_tag[[2001:db8::1]:5000-False] tests/unit/utils_build_test.py::test_match_tag[[fe80::1%eth0]:5000/repo-False] tests/unit/utils_build_test.py::test_match_tag[[fe80::1%@invalidzone]:5000/repo-False]