diff --git a/backend/.dockerignore b/backend/.dockerignore
index 566d89485a..d1136a4a87 100644
--- a/backend/.dockerignore
+++ b/backend/.dockerignore
@@ -12,6 +12,7 @@ sonar-project.properties
 
 # tests
 **/tests*
+!tests/factories*
 
 # celery
 broker/*
diff --git a/backend/tests/plugins.py b/backend/tests/plugins.py
index c7ef30b5ba..3f992b5a55 100644
--- a/backend/tests/plugins.py
+++ b/backend/tests/plugins.py
@@ -1,70 +1,13 @@
 from __future__ import annotations
 
-import contextlib
-import datetime
-from typing import Any
-from unittest.mock import patch
-
 import pytest
 
 
 @pytest.hookimpl(tryfirst=True)
 def pytest_load_initial_conftests(early_config: pytest.Config, parser: pytest.Parser, args: list[str]) -> None:
-    setup_now_tt()
-
-
-def setup_now_tt():
-    """
-    Setup NowTT for tests so that when freezegun is used,
-    it will also setup the offset in the database for NowTT.
-    """
-    from freezegun.api import _freeze_time  # noqa: PLC2701
-
-    freezes: dict[int, int] = {}
-
-    class MockFreezeTime(_freeze_time):
-        def start(self) -> Any:
-            """Called when 'freeze_time' is started."""
-            from utils.db import NowTT
-
-            # Calculate offset for time travel.
-            delta = self.time_to_freeze - datetime.datetime.now()
-            offset = int(delta.total_seconds())
-
-            # Set offset for to database, but ignore errors if test doesn't have database access.
-            with contextlib.suppress(RuntimeError):
-                NowTT.set_offset(seconds=offset)
+    from utils.utils import setup_now_tt
 
-            # Save offset in case we make multiple calls to 'freeze_time'.
-            freezes[id(self)] = offset
-
-            return super().start()
-
-        def stop(self) -> None:
-            """Called when 'freeze_time' is stopped."""
-            from utils.db import NowTT
-
-            # Remove the saved offset.
-            del freezes[id(self)]
-
-            # If there are no more freezes, reset the offset to 0.
-            # Otherwise, use the last set offset.
-            if freezes:
-                key, value = freezes.popitem()
-                freezes[key] = value
-            else:
-                value = 0
-
-            # Set offset for to database, but ignore errors if test doesn't have database access.
-            with contextlib.suppress(RuntimeError):
-                NowTT.set_offset(seconds=value)
-
-            return super().stop()
-
-    # Just apply the patch for the whole duration of the test run.
-    mocked_freeze_factory = patch("freezegun.api._freeze_time", MockFreezeTime)
-    mocked_freeze_factory.start()
-    return mocked_freeze_factory
+    setup_now_tt()
 
 
 @pytest.hookimpl()
diff --git a/backend/tilavarauspalvelu/api/frontend_testing_api/helpers.py b/backend/tilavarauspalvelu/api/frontend_testing_api/helpers.py
index 3ab5ee59f0..ac8d57e1a9 100644
--- a/backend/tilavarauspalvelu/api/frontend_testing_api/helpers.py
+++ b/backend/tilavarauspalvelu/api/frontend_testing_api/helpers.py
@@ -5,7 +5,7 @@
 
 from freezegun import freeze_time
 
-from tests.plugins import setup_now_tt
+from utils.utils import setup_now_tt
 
 if TYPE_CHECKING:
     import datetime
diff --git a/backend/utils/utils.py b/backend/utils/utils.py
index e08c98898d..0df13cb791 100644
--- a/backend/utils/utils.py
+++ b/backend/utils/utils.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import base64
+import contextlib
 import datetime
 import hashlib
 import hmac
@@ -9,6 +10,7 @@
 import re
 import urllib.parse
 from typing import TYPE_CHECKING, Any, Generic, TypeVar
+from unittest.mock import patch
 
 from django.conf import settings
 from django.core.cache import cache
@@ -28,6 +30,7 @@
 __all__ = [
     "comma_sep_str",
     "get_text_search_language",
+    "setup_now_tt",
     "update_query_params",
     "with_indices",
 ]
@@ -262,3 +265,57 @@ def get_jwt_payload(json_web_token: str) -> dict[str, Any]:
     payload_part += "=" * divmod(len(payload_part), 4)[1]  # Add padding to the payload if needed
     payload: str = base64.urlsafe_b64decode(payload_part).decode()  # Decode the payload
     return json.loads(payload)  # Return the payload as a dict
+
+
+def setup_now_tt() -> Any:
+    """
+    Setup NowTT for tests so that when freezegun is used,
+    it will also setup the offset in the database for NowTT.
+    """
+    from freezegun.api import _freeze_time  # noqa: PLC2701
+
+    freezes: dict[int, int] = {}
+
+    class MockFreezeTime(_freeze_time):
+        def start(self) -> Any:
+            """Called when 'freeze_time' is started."""
+            from utils.db import NowTT
+
+            # Calculate offset for time travel.
+            delta = self.time_to_freeze - local_datetime()
+            offset = int(delta.total_seconds())
+
+            # Set offset for to database, but ignore errors if test doesn't have database access.
+            with contextlib.suppress(RuntimeError):
+                NowTT.set_offset(seconds=offset)
+
+            # Save offset in case we make multiple calls to 'freeze_time'.
+            freezes[id(self)] = offset
+
+            return super().start()
+
+        def stop(self) -> None:
+            """Called when 'freeze_time' is stopped."""
+            from utils.db import NowTT
+
+            # Remove the saved offset.
+            del freezes[id(self)]
+
+            # If there are no more freezes, reset the offset to 0.
+            # Otherwise, use the last set offset.
+            if freezes:
+                key, value = freezes.popitem()
+                freezes[key] = value
+            else:
+                value = 0
+
+            # Set offset for to database, but ignore errors if test doesn't have database access.
+            with contextlib.suppress(RuntimeError):
+                NowTT.set_offset(seconds=value)
+
+            return super().stop()
+
+    # Just apply the patch for the whole duration of the test run.
+    mocked_freeze_factory = patch("freezegun.api._freeze_time", MockFreezeTime)
+    mocked_freeze_factory.start()
+    return mocked_freeze_factory
diff --git a/docker-compose.yml b/docker-compose.yml
index 48855a5d42..83e184dd56 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -62,6 +62,8 @@ services:
     build:
       context: backend/
       dockerfile: docker/Dockerfile
+      args:
+        DEPS: main,admin,celery,test,lint
     env_file:
       - backend/.env
     environment: