diff --git a/tests/data/2.preprocessed_data/PPG/PPG_meta.json b/tests/data/2.preprocessed_data/PPG/PPG_meta.json
index d5d72d8..8461d45 100644
--- a/tests/data/2.preprocessed_data/PPG/PPG_meta.json
+++ b/tests/data/2.preprocessed_data/PPG/PPG_meta.json
@@ -5,7 +5,7 @@
     "ppp_source_protobuf": "WatchData.PPG.Week104.raw",
     "metadata_version": "0.1",
     "start_iso8601": "27-Jun-2021 16:52:20 UTC",
-    "end_iso8601": "27-Jun-2021 17:03:04 +0000",
+    "end_iso8601": "27-Jun-2021 17:03:04 UTC",
     "scale_factors": 1,
     "rows": 19338,
     "data_type": "float",