diff --git a/quartz_solar_forecast/dataset/make_test_set.py b/quartz_solar_forecast/dataset/make_test_set.py
index eb4cf0b3..d96a6c07 100644
--- a/quartz_solar_forecast/dataset/make_test_set.py
+++ b/quartz_solar_forecast/dataset/make_test_set.py
@@ -116,7 +116,7 @@ def filter_timestamps_if_hf_files_exists(timestamps_full: pd.DatetimeIndex):
     fs = HfFileSystem()
     # print(fs.ls("datasets/openclimatefix/dwd-icon-eu/data/2022/4/11/", detail=False))
     for timestamp in timestamps_full:
-        timestamp_floor = timestamp.floor("6H")
+        timestamp_floor = timestamp.floor("6h")
         _, huggingface_file = make_hf_filename(timestamp_floor)
         huggingface_file = huggingface_file[14:]
 
diff --git a/quartz_solar_forecast/eval/nwp.py b/quartz_solar_forecast/eval/nwp.py
index 1edc3a20..ac32f59d 100644
--- a/quartz_solar_forecast/eval/nwp.py
+++ b/quartz_solar_forecast/eval/nwp.py
@@ -81,7 +81,7 @@ def get_nwp_for_one_timestamp_one_location(
     # print(fs.ls("datasets/openclimatefix/dwd-icon-eu/data/2022/4/11/", detail=False))
 
     # round timestamp to 6 hours floor
-    timestamp_floor = timestamp.floor("6H")
+    timestamp_floor = timestamp.floor("6h")
     date_and_hour, huggingface_file = make_hf_filename(timestamp_floor)
 
     # dataset variables, note these are unique for ICON