diff --git a/scripts/data_collector/yahoo/collector.py b/scripts/data_collector/yahoo/collector.py
index a1b4d64f65..b77537700e 100644
--- a/scripts/data_collector/yahoo/collector.py
+++ b/scripts/data_collector/yahoo/collector.py
@@ -392,7 +392,8 @@ def normalize_yahoo(
         columns = copy.deepcopy(YahooNormalize.COLUMNS)
         df = df.copy()
         df.set_index(date_field_name, inplace=True)
-        df.index = pd.to_datetime(df.index)
+        df.index = df.index.astype(str)
+        df.index = pd.to_datetime(df.index.str[:10], format="%Y-%m-%d")
         df.index = df.index.tz_localize(None)
         df = df[~df.index.duplicated(keep="first")]
         if calendar_list is not None: