diff --git a/tests/test_utils/test_formatting.py b/tests/test_utils/test_formatting.py
index 5928fc62..8efc1598 100644
--- a/tests/test_utils/test_formatting.py
+++ b/tests/test_utils/test_formatting.py
@@ -1,3 +1,5 @@
+from datetime import datetime, timezone
+
 import pytest
 
 from aiogram.enums import MessageEntityType
@@ -120,6 +122,10 @@ class TestNode:
                 DateTime("test", unix_time=42, date_time_format="yMd"),
                 '<tg-time unix="42" format="yMd">test</tg-time>',
             ],
+            [
+                DateTime("test", unix_time=42),
+                '<tg-time unix="42">test</tg-time>',
+            ],
         ],
     )
     def test_render_plain_only(self, node: Text, result: str):
@@ -379,6 +385,22 @@ class TestUtils:
         assert node._params["unix_time"] == 42
         assert node._params["date_time_format"] == "yMd"
 
+    def test_date_time_with_datetime_object(self):
+        dt = datetime(2024, 1, 1, 0, 0, 0, tzinfo=timezone.utc)
+        node = DateTime("test", unix_time=dt)
+        assert isinstance(node, DateTime)
+        assert node._params["unix_time"] == 1704067200
+
+    def test_date_time_with_datetime_and_format(self):
+        dt = datetime(2024, 1, 1, 0, 0, 0, tzinfo=timezone.utc)
+        node = DateTime("test", unix_time=dt, date_time_format="yMd")
+        assert node._params["unix_time"] == 1704067200
+        assert node._params["date_time_format"] == "yMd"
+
+    def test_date_time_as_markdown(self):
+        node = DateTime("test", unix_time=42, date_time_format="yMd")
+        assert node.as_markdown() == "![test](tg://time?unix=42&format=yMd)"
+
     def test_as_line(self):
         node = as_line("test", "test", "test")
         assert isinstance(node, Text)
diff --git a/tests/test_utils/test_text_decorations.py b/tests/test_utils/test_text_decorations.py
index 82039229..6325edb8 100644
--- a/tests/test_utils/test_text_decorations.py
+++ b/tests/test_utils/test_text_decorations.py
@@ -1,3 +1,5 @@
+from datetime import datetime, timezone
+
 import pytest
 
 from aiogram.types import MessageEntity, User
@@ -146,6 +148,16 @@ class TestTextDecoration:
                 ),
                 "![test](tg://time?unix=42&format=yMd)",
             ],
+            [
+                html_decoration,
+                MessageEntity(type="date_time", offset=0, length=5, unix_time=42),
+                '<tg-time unix="42">test</tg-time>',
+            ],
+            [
+                markdown_decoration,
+                MessageEntity(type="date_time", offset=0, length=5, unix_time=42),
+                "![test](tg://time?unix=42)",
+            ],
         ],
     )
     def test_apply_single_entity(
@@ -153,6 +165,38 @@ class TestTextDecoration:
     ):
         assert decorator.apply_entity(entity, "test") == result
 
+    @pytest.mark.parametrize(
+        "decorator,date_time_format,expected",
+        [
+            (
+                html_decoration,
+                None,
+                '<tg-time unix="1704067200">test</tg-time>',
+            ),
+            (
+                html_decoration,
+                "yMd",
+                '<tg-time unix="1704067200" format="yMd">test</tg-time>',
+            ),
+            (
+                markdown_decoration,
+                None,
+                "![test](tg://time?unix=1704067200)",
+            ),
+            (
+                markdown_decoration,
+                "yMd",
+                "![test](tg://time?unix=1704067200&format=yMd)",
+            ),
+        ],
+    )
+    def test_date_time_with_datetime_object(
+        self, decorator: TextDecoration, date_time_format: str | None, expected: str
+    ):
+        dt = datetime(2024, 1, 1, 0, 0, 0, tzinfo=timezone.utc)
+        result = decorator.date_time("test", unix_time=dt, date_time_format=date_time_format)
+        assert result == expected
+
     def test_unknown_apply_entity(self):
         assert (
             html_decoration.apply_entity(
@@ -318,6 +362,22 @@ class TestTextDecoration:
                 ],
                 "<b>test@example.com</b>",
             ],
+            [
+                html_decoration,
+                "test",
+                [MessageEntity(type="date_time", offset=0, length=4, unix_time=42)],
+                '<tg-time unix="42">test</tg-time>',
+            ],
+            [
+                html_decoration,
+                "test",
+                [
+                    MessageEntity(
+                        type="date_time", offset=0, length=4, unix_time=42, date_time_format="yMd"
+                    )
+                ],
+                '<tg-time unix="42" format="yMd">test</tg-time>',
+            ],
         ],
     )
     def test_unparse(