diff --git a/README.md b/README.md
index 71947c7..38b9b9b 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ Syntax](https://docs.python.org/3/library/string.html#format-string-syntax).
 
 ### Installation
 
-``` bash
+```bash
 pip install django-dynamic-filenames
 ```
 
@@ -15,16 +15,17 @@ pip install django-dynamic-filenames
 
 Basic example:
 
-``` python
+```python
 from django.db import models
 from dynamic_filenames import FilePattern
 
 upload_to_pattern = FilePattern(
-    filename_pattern='{app_label:.25}/{model_name:.30}/{uuid:base32}{ext}'
+    filename_pattern='{app_label:.25}/{model_name:.30}/{instance.created:%Y-%m-%d}/{uuid:base32}{ext}'
 )
 
 class FileModel(models.Model):
     my_file = models.FileField(upload_to=upload_to_pattern)
+    created = models.DateTimeField(auto_now_add=True)
 ```
 
 Auto slug example:
@@ -109,7 +110,7 @@ You can also use a special slug type specifier, that slugifies strings.
 
 Example:
 
-``` python
+```python
 from django.db import models
 from dynamic_filenames import FilePattern
 
diff --git a/pyproject.toml b/pyproject.toml
index aa24c6a..12454e2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -68,7 +68,7 @@ testpaths = ["tests"]
 DJANGO_SETTINGS_MODULE = "tests.testapp.settings"
 
 [tool.coverage.run]
-source = ["django_esm"]
+source = ["dynamic_filenames"]
 
 [tool.coverage.report]
 show_missing = true
diff --git a/tests/test_dynamic_filenames.py b/tests/test_dynamic_filenames.py
index a58b984..0c21048 100644
--- a/tests/test_dynamic_filenames.py
+++ b/tests/test_dynamic_filenames.py
@@ -1,3 +1,4 @@
+import datetime
 import uuid
 
 import pytest
@@ -178,6 +179,17 @@ def test_uuid(self):
             == "522d6f3519204b0fb82ae8f558af2749.txt"
         )
 
+    def test_date(self):
+        assert (
+            FilePattern(filename_pattern="{instance.created:%Y-%m-%d}{ext}")(
+                instance=DefaultModel(
+                    title="best model", created=datetime.date(2021, 9, 10)
+                ),
+                filename="some_file.txt",
+            )
+            == "2021-09-10.txt"
+        )
+
 
 class TestExtendedUUID:
     def test_uuid_2_base10(self):
diff --git a/tests/testapp/models.py b/tests/testapp/models.py
index ad18c77..159623f 100644
--- a/tests/testapp/models.py
+++ b/tests/testapp/models.py
@@ -10,3 +10,4 @@
 class DefaultModel(models.Model):
     title = models.CharField(max_length=100, default="hello goodby")
     file_field = models.FileField(upload_to=upload_to_pattern)
+    created = models.DateTimeField(auto_now_add=True)