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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.