diff --git a/frappe/model/naming.py b/frappe/model/naming.py
index f6a3846699..b674b0cd81 100644
--- a/frappe/model/naming.py
+++ b/frappe/model/naming.py
@@ -317,9 +317,9 @@ def parse_naming_series(
 			part = frappe.defaults.get_user_default("fiscal_year")
 		elif e.startswith("{") and doc:
 			e = e.replace("{", "").replace("}", "")
-			part = doc.get(e)
+			part = (cstr(doc.get(e)) or "").strip()
 		elif doc and doc.get(e):
-			part = doc.get(e)
+			part = (cstr(doc.get(e)) or "").strip()
 		else:
 			part = e
 
diff --git a/frappe/tests/test_naming.py b/frappe/tests/test_naming.py
index d966fd5ce8..305df66209 100644
--- a/frappe/tests/test_naming.py
+++ b/frappe/tests/test_naming.py
@@ -12,7 +12,7 @@ from frappe.model.naming import (
 	revert_series_if_last,
 )
 from frappe.tests.utils import FrappeTestCase
-from frappe.utils import now_datetime
+from frappe.utils import now_datetime, nowdate, nowtime
 
 
 class TestNaming(FrappeTestCase):
@@ -100,6 +100,20 @@ class TestNaming(FrappeTestCase):
 
 		self.assertEqual(doc.name, f"TODO-{now_datetime().strftime('%m')}-{description}-{series:02}")
 
+	def test_format_autoname_for_datetime_field(self):
+		"""Test if datetime, date and time objects get converted to strings for naming."""
+		doctype = new_doctype(autoname="format:TODO-{field}-{##}").insert()
+
+		for field in [now_datetime(), nowdate(), nowtime()]:
+			doc = frappe.new_doc(doctype.name)
+			doc.field = field
+			doc.insert()
+
+			series = getseries("", 2)
+			series = int(series) - 1
+
+			self.assertEqual(doc.name, f"TODO-{field}-{series:02}")
+
 	def test_format_autoname_for_consecutive_week_number(self):
 		"""
 		Test if braced params are replaced for consecutive week number in format autoname