diff --git a/apiserver/dora/service/code/sync/etl_github_handler.py b/apiserver/dora/service/code/sync/etl_github_handler.py
index a039fa108..b8f0bceb0 100644
--- a/apiserver/dora/service/code/sync/etl_github_handler.py
+++ b/apiserver/dora/service/code/sync/etl_github_handler.py
@@ -29,7 +29,7 @@
 )
 from dora.store.repos.code import CodeRepoService
 from dora.store.repos.core import CoreRepoService
-from dora.utils.time import time_now
+from dora.utils.time import time_now, ISO_8601_DATE_FORMAT
 
 PR_PROCESSING_CHUNK_SIZE = 100
 
@@ -349,7 +349,7 @@ def _to_pr_commits(
 
     @staticmethod
     def _dt_from_github_dt_string(dt_string: str) -> datetime:
-        dt_without_timezone = datetime.strptime(dt_string, "%Y-%m-%dT%H:%M:%SZ")
+        dt_without_timezone = datetime.strptime(dt_string, ISO_8601_DATE_FORMAT)
         return dt_without_timezone.replace(tzinfo=pytz.UTC)
 
 
diff --git a/apiserver/dora/service/workflows/sync/etl_github_actions_handler.py b/apiserver/dora/service/workflows/sync/etl_github_actions_handler.py
index bd27e10c3..2ce3bd431 100644
--- a/apiserver/dora/service/workflows/sync/etl_github_actions_handler.py
+++ b/apiserver/dora/service/workflows/sync/etl_github_actions_handler.py
@@ -168,9 +168,8 @@ def _get_repo_workflow_run_duration(
 
     @staticmethod
     def _get_datetime_from_gh_datetime(datetime_str: str) -> datetime:
-        return datetime.strptime(datetime_str, ISO_8601_DATE_FORMAT).astimezone(
-            tz=pytz.UTC
-        )
+        dt_without_timezone = datetime.strptime(datetime_str, ISO_8601_DATE_FORMAT)
+        return dt_without_timezone.replace(tzinfo=pytz.UTC)
 
 
 def get_github_actions_etl_handler(org_id):