diff --git a/parsedmarc/__init__.py b/parsedmarc/__init__.py
index e36113f..b184f75 100644
--- a/parsedmarc/__init__.py
+++ b/parsedmarc/__init__.py
@@ -1956,7 +1956,7 @@ def get_dmarc_reports_from_mailbox(
             current_time = datetime.now(timezone.utc).strftime("%d-%b-%Y")
         elif isinstance(connection, MSGraphConnection):
             since = (datetime.now(timezone.utc) - timedelta(minutes=_since)).isoformat()
-            current_time = datetime.now(timezone.utc).isoformat() + "Z"
+            current_time = datetime.now(timezone.utc).isoformat()
         elif isinstance(connection, GmailConnection):
             since = (datetime.now(timezone.utc) - timedelta(minutes=_since)).strftime(
                 "%s"