pandas.DatetimeIndex.is_year_start¶
-
property
DatetimeIndex.
is_year_start
¶ Indicate whether the date is the first day of a year.
- Returns
Series or DatetimeIndex
The same type as the original data with boolean values. Series will have the same name and index. DatetimeIndex will have the same name.
See also
is_year_end
Similar property indicating the last day of the year.
Examples
This method is available on Series with datetime values under the
.dt
accessor, and directly on DatetimeIndex.>>> dates = pd.Series(pd.date_range("2017-12-30", periods=3)) >>> dates 0 2017-12-30 1 2017-12-31 2 2018-01-01 dtype: datetime64[ns]
>>> dates.dt.is_year_start 0 False 1 False 2 True dtype: bool
>>> idx = pd.date_range("2017-12-30", periods=3) >>> idx DatetimeIndex(['2017-12-30', '2017-12-31', '2018-01-01'], dtype='datetime64[ns]', freq='D')
>>> idx.is_year_start array([False, False, True])