Convert timestamps to strings explicitly

diff --git a/src/littlesongplace/jams.py b/src/littlesongplace/jams.py
index 468a54421c0e6c7f9c8d7605b8cfeb2aeb48b745..a14576f5060ab338e8e969217d2f157d370efc50 100644 (file)
--- a/src/littlesongplace/jams.py
+++ b/src/littlesongplace/jams.py
@@ -215,10 +215,10 @@ def _validate_timestamp(timestamp):
         dt = datetime.fromisoformat(timestamp)
         if dt.tzinfo:
             # Has timezone, convert to UTC
-            return dt.astimezone(timezone.utc)
+            return dt.astimezone(timezone.utc).isoformat()
         else:
             # No timezone, assume it is already UTC
-            return dt.replace(tzinfo=timezone.utc)
+            return dt.replace(tzinfo=timezone.utc).isoformat()
     except ValueError:
         abort(400)