The year of the datetime.
Examples
>>> datetime_series = pd.Series(
... pd.date_range("2000-01-01", periods=3, freq="YE")
... )
>>> datetime_series
0 2000-12-31
1 2001-12-31
2 2002-12-31
dtype: datetime64[ns]
>>> datetime_series.dt.year
0 2000
1 2001
2 2002
dtype: int32
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https://pandas.pydata.org/pandas-docs/version/2.3.0/reference/api/pandas.Series.dt.year.html