diff --git a/spoolman/database/filament.py b/spoolman/database/filament.py
index 59ef66b..6d5ebef 100644
--- a/spoolman/database/filament.py
+++ b/spoolman/database/filament.py
@@ -2,6 +2,7 @@
 
 import logging
 from collections.abc import Sequence
+from datetime import datetime
 from typing import Optional, Union
 
 from sqlalchemy import func, select
@@ -44,6 +45,7 @@ async def create(
 
     db_item = models.Filament(
         name=name,
+        registered=datetime.utcnow().replace(microsecond=0),
         vendor=vendor_item,
         material=material,
         price=price,
diff --git a/spoolman/database/spool.py b/spoolman/database/spool.py
index da9148f..7b4e543 100644
--- a/spoolman/database/spool.py
+++ b/spoolman/database/spool.py
@@ -61,6 +61,7 @@ async def create(
 
     db_item = models.Spool(
         filament=filament_item,
+        registered=datetime.utcnow().replace(microsecond=0),
         used_weight=used_weight,
         first_used=first_used,
         last_used=last_used,
diff --git a/spoolman/database/vendor.py b/spoolman/database/vendor.py
index d0e6039..2619f5b 100644
--- a/spoolman/database/vendor.py
+++ b/spoolman/database/vendor.py
@@ -1,5 +1,6 @@
 """Helper functions for interacting with vendor database objects."""
 
+from datetime import datetime
 from typing import Optional
 
 from sqlalchemy import func, select
@@ -19,6 +20,7 @@ async def create(
     """Add a new vendor to the database."""
     db_item = models.Vendor(
         name=name,
+        registered=datetime.utcnow().replace(microsecond=0),
         comment=comment,
     )
     db.add(db_item)
diff --git a/tests_integration/tests/filament/test_add.py b/tests_integration/tests/filament/test_add.py
index accb310..13d3ff5 100644
--- a/tests_integration/tests/filament/test_add.py
+++ b/tests_integration/tests/filament/test_add.py
@@ -1,5 +1,6 @@
 """Integration tests for the Filament API endpoint."""
 
+from datetime import datetime, timezone
 from typing import Any
 
 import httpx
@@ -62,6 +63,10 @@ def test_add_filament(random_vendor: dict[str, Any]):
         "color_hex": color_hex,
     }
 
+    # Verify that registered happened almost now (within 1 minute)
+    diff = abs((datetime.now(tz=timezone.utc) - datetime.fromisoformat(filament["registered"])).total_seconds())
+    assert diff < 60
+
     # Clean up
     httpx.delete(f"{URL}/api/v1/filament/{filament['id']}").raise_for_status()
 
diff --git a/tests_integration/tests/spool/test_add.py b/tests_integration/tests/spool/test_add.py
index a64b0e1..f5ae7fd 100644
--- a/tests_integration/tests/spool/test_add.py
+++ b/tests_integration/tests/spool/test_add.py
@@ -1,5 +1,6 @@
 """Integration tests for the Spool API endpoint."""
 
+from datetime import datetime, timezone
 from typing import Any
 
 import httpx
@@ -63,6 +64,10 @@ def test_add_spool_remaining_weight(random_filament: dict[str, Any]):
         "archived": archived,
     }
 
+    # Verify that registered happened almost now (within 1 minute)
+    diff = abs((datetime.now(tz=timezone.utc) - datetime.fromisoformat(spool["registered"])).total_seconds())
+    assert diff < 60
+
     # Clean up
     httpx.delete(f"{URL}/api/v1/spool/{spool['id']}").raise_for_status()
 
diff --git a/tests_integration/tests/vendor/test_add.py b/tests_integration/tests/vendor/test_add.py
index d82ac97..547a60e 100644
--- a/tests_integration/tests/vendor/test_add.py
+++ b/tests_integration/tests/vendor/test_add.py
@@ -1,5 +1,7 @@
 """Integration tests for the Vendor API endpoint."""
 
+from datetime import datetime, timezone
+
 import httpx
 
 URL = "http://spoolman:8000"
@@ -25,6 +27,10 @@ def test_add_vendor():
         "comment": comment,
     }
 
+    # Verify that registered happened almost now (within 1 minute)
+    diff = abs((datetime.now(tz=timezone.utc) - datetime.fromisoformat(vendor["registered"])).total_seconds())
+    assert diff < 60
+
     # Clean up
     httpx.delete(f"{URL}/api/v1/vendor/{vendor['id']}").raise_for_status()