The day of the datetime.
Examples
>>> datetime_series = pd.Series(
... pd.date_range("2000-01-01", periods=3, freq="D")
... )
>>> datetime_series
0 2000-01-01
1 2000-01-02
2 2000-01-03
dtype: datetime64[ns]
>>> datetime_series.dt.day
0 1
1 2
2 3
dtype: int32
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https://pandas.pydata.org/pandas-docs/version/2.3.0/reference/api/pandas.DatetimeIndex.day.html