diff --git a/influxdb/_dataframe_client.py b/influxdb/_dataframe_client.py
index 06da7ac4..9d847744 100644
--- a/influxdb/_dataframe_client.py
+++ b/influxdb/_dataframe_client.py
@@ -238,7 +238,8 @@ def _convert_dataframe_to_json(dataframe,
field_columns = list(
set(dataframe.columns).difference(set(tag_columns)))
- dataframe.index = pd.to_datetime(dataframe.index)
+ if not isinstance(dataframe.index, pd.DatetimeIndex):
+ dataframe.index = pd.to_datetime(dataframe.index)
if dataframe.index.tzinfo is None:
dataframe.index = dataframe.index.tz_localize('UTC')
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