Fix handling of dates in logs view

- Fixes #1742
- Also fixes the time zone on the aggregated logs API

endpoints/api/logs.py

@@ -14,6 +14,7 @@ from auth.auth_context import get_authenticated_user
 from data import model, database
 from auth import scopes
 from app import avatar
+from tzlocal import get_localzone
 
 LOGS_PER_PAGE = 20
 SERVICE_LEVEL_LOG_KINDS = set(['service_key_create', 'service_key_approve', 'service_key_delete',
@@ -41,7 +42,7 @@ def aggregated_log_view(log, kinds, start_time):
   # Because we aggregate based on the day of the month in SQL, we only have that information.
   # Therefore, create a synthetic date based on the day and the month of the start time.
   # Logs are allowed for a maximum period of one week, so this calculation should always work.
-  synthetic_date = datetime(start_time.year, start_time.month, int(log.day))
+  synthetic_date = datetime(start_time.year, start_time.month, int(log.day), tzinfo=get_localzone())
   if synthetic_date.day < start_time.day:
     synthetic_date = synthetic_date + relativedelta(months=1)