Closed
Description
import pandas as pd dtype1 = "datetime64[ns, US/Eastern]" dtype2 = "timestamp[ns, US/Eastern][pyarrow]" ts = pd.Timestamp("2025-07-03 18:10") >>> pd.Series([ts], dtype=dtype1)[0] Timestamp('2025-07-03 18:10:00-0400', tz='US/Eastern') >>> pd.Series([ts], dtype=dtype2)[0] Timestamp('2025-07-03 14:10:00-0400', tz='US/Eastern')Long ago we decided that when passing tznaive datetimes and specifying a tzaware dtype, we treat the input as a wall-time. It looks like the pyarrow path (which I'm pretty sure just ends up calling pa.array([ts], type=...)) treats it as a UTC time.