diff --git a/antarest/study/business/model/link_model.py b/antarest/study/business/model/link_model.py
index 8bb48af215..3d049b94ff 100644
--- a/antarest/study/business/model/link_model.py
+++ b/antarest/study/business/model/link_model.py
@@ -97,9 +97,7 @@ class FilterOption(EnumIgnoreCase):
     ANNUAL = "annual"
 
 
-def validate_filters(
-    filter_value: t.Union[t.List[FilterOption], str], enum_cls: t.Type[FilterOption]
-) -> t.List[FilterOption]:
+def validate_filters(filter_value: t.List[FilterOption] | str, enum_cls: t.Type[FilterOption]) -> t.List[FilterOption]:
     if isinstance(filter_value, str):
         if not filter_value.strip():
             return []
diff --git a/antarest/study/storage/variantstudy/model/command/remove_multiple_binding_constraints.py b/antarest/study/storage/variantstudy/model/command/remove_multiple_binding_constraints.py
index 2863466707..36c97806ae 100644
--- a/antarest/study/storage/variantstudy/model/command/remove_multiple_binding_constraints.py
+++ b/antarest/study/storage/variantstudy/model/command/remove_multiple_binding_constraints.py
@@ -9,10 +9,12 @@
 # SPDX-License-Identifier: MPL-2.0
 #
 # This file is part of the Antares project.
+
 import typing as t
 
 from typing_extensions import override
 
+from antarest.core.exceptions import NoConstraintError
 from antarest.study.model import STUDY_VERSION_8_7
 from antarest.study.storage.rawstudy.model.filesystem.config.binding_constraint import DEFAULT_GROUP
 from antarest.study.storage.rawstudy.model.filesystem.config.model import FileStudyTreeConfig
@@ -40,16 +42,18 @@ def _apply_config(self, study_data: FileStudyTreeConfig) -> OutputTuple:
         # If at least one bc is missing in the database, we raise an error
         already_existing_ids = {binding.id for binding in study_data.bindings}
         missing_bc_ids = [id_ for id_ in self.ids if id_ not in already_existing_ids]
+
         if missing_bc_ids:
-            return CommandOutput(status=False, message=f"Binding constraint not found: '{missing_bc_ids}'"), {}
-        return CommandOutput(status=True, message=f"Binding constraint removed"), {}
+            return CommandOutput(status=False, message=f"Binding constraints missing: {missing_bc_ids}"), {}
+
+        return CommandOutput(status=True), {}
 
     @override
     def _apply(self, study_data: FileStudy, listener: t.Optional[ICommandListener] = None) -> CommandOutput:
-        command_output, _ = self._apply_config(study_data.config)
-
-        if not command_output.status:
-            return command_output
+        try:
+            self._apply_config(study_data.config)
+        except NoConstraintError as e:
+            return CommandOutput(status=False, message=str(e))
 
         binding_constraints = study_data.tree.get(["input", "bindingconstraints", "bindingconstraints"])
 
@@ -83,7 +87,7 @@ def _apply(self, study_data: FileStudy, listener: t.Optional[ICommandListener] =
         removed_groups = old_groups - new_groups
         remove_bc_from_scenario_builder(study_data, removed_groups)
 
-        return command_output
+        return CommandOutput(status=True, message="Binding constraints deleted successfully.")
 
     @override
     def to_dto(self) -> CommandDTO:
diff --git a/antarest/study/storage/variantstudy/variant_study_service.py b/antarest/study/storage/variantstudy/variant_study_service.py
index fc9d447ea0..c6b2f1fc06 100644
--- a/antarest/study/storage/variantstudy/variant_study_service.py
+++ b/antarest/study/storage/variantstudy/variant_study_service.py
@@ -15,7 +15,7 @@
 import re
 import shutil
 import typing as t
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from functools import reduce
 from pathlib import Path
 from uuid import uuid4
@@ -237,7 +237,7 @@ def append_commands(
                 study_version=str(command.study_version),
                 # params.user cannot be None, since previous checks were successful
                 user_id=params.user.id,  # type: ignore
-                updated_at=datetime.utcnow(),
+                updated_at=datetime.now(timezone.utc),
             )
             for i, command in enumerate(validated_commands)
         ]
@@ -279,7 +279,7 @@ def replace_commands(
                 version=command.version,
                 study_version=str(command.study_version),
                 user_id=params.user.id,  # type: ignore
-                updated_at=datetime.utcnow(),
+                updated_at=datetime.now(timezone.utc),
             )
             for i, command in enumerate(validated_commands)
         ]
@@ -634,8 +634,8 @@ def create_variant_study(self, uuid: str, name: str, params: RequestParameters)
             parent_id=uuid,
             path=study_path,
             public_mode=study.public_mode,
-            created_at=datetime.utcnow(),
-            updated_at=datetime.utcnow(),
+            created_at=datetime.now(timezone.utc),
+            updated_at=datetime.now(timezone.utc),
             version=study.version,
             folder=(re.sub(study.id, new_id, study.folder) if study.folder is not None else None),
             groups=study.groups,  # Create inherit_group boolean
@@ -935,8 +935,8 @@ def copy(
             parent_id=src_meta.parent_id,
             path=study_path,
             public_mode=PublicMode.NONE if groups else PublicMode.READ,
-            created_at=datetime.utcnow(),
-            updated_at=datetime.utcnow(),
+            created_at=datetime.now(timezone.utc),
+            updated_at=datetime.now(timezone.utc),
             version=src_meta.version,
             groups=groups,
             snapshot=None,
@@ -1206,8 +1206,8 @@ def _clear_all_snapshots(self) -> None:
                 )
             )
             for variant in variant_list:
-                if variant.updated_at and variant.updated_at < datetime.utcnow() - self._retention_time:
-                    if variant.last_access and variant.last_access < datetime.utcnow() - self._retention_time:
+                if variant.updated_at and variant.updated_at < datetime.now(timezone.utc) - self._retention_time:
+                    if variant.last_access and variant.last_access < datetime.now(timezone.utc) - self._retention_time:
                         self._variant_study_service.clear_snapshot(variant)
 
     def run_task(self, notifier: ITaskNotifier) -> TaskResult: