[Chore/Refactor] Use centralized naive_utc_now for UTC datetime operations (#24352)

Signed-off-by: -LAN- <laipz8200@outlook.com>

api/tasks/add_document_to_index_task.py

@@ -1,4 +1,3 @@
-import datetime
 import logging
 import time
 
@@ -10,6 +9,7 @@ from core.rag.index_processor.index_processor_factory import IndexProcessorFacto
 from core.rag.models.document import ChildDocument, Document
 from extensions.ext_database import db
 from extensions.ext_redis import redis_client
+from libs.datetime_utils import naive_utc_now
 from models.dataset import DatasetAutoDisableLog, DocumentSegment
 from models.dataset import Document as DatasetDocument
 
@@ -95,7 +95,7 @@ def add_document_to_index_task(dataset_document_id: str):
                 DocumentSegment.enabled: True,
                 DocumentSegment.disabled_at: None,
                 DocumentSegment.disabled_by: None,
-                DocumentSegment.updated_at: datetime.datetime.now(datetime.UTC).replace(tzinfo=None),
+                DocumentSegment.updated_at: naive_utc_now(),
             }
         )
         db.session.commit()
@@ -107,7 +107,7 @@ def add_document_to_index_task(dataset_document_id: str):
     except Exception as e:
         logging.exception("add document to index failed")
         dataset_document.enabled = False
-        dataset_document.disabled_at = datetime.datetime.now(datetime.UTC).replace(tzinfo=None)
+        dataset_document.disabled_at = naive_utc_now()
         dataset_document.indexing_status = "error"
         dataset_document.error = str(e)
         db.session.commit()