pandas.DatetimeIndex.is_month_start#
- property DatetimeIndex.is_month_start[source]#
Indicates whether the date is the first day of the month.
- Returns
- Series or array
For Series, returns a Series with boolean values. For DatetimeIndex, returns a boolean array.
See also
is_month_start
Return a boolean indicating whether the date is the first day of the month.
is_month_end
Return a boolean indicating whether the date is the last day of the month.
Examples
This method is available on Series with datetime values under the
.dt
accessor, and directly on DatetimeIndex.>>> s = pd.Series(pd.date_range("2018-02-27", periods=3)) >>> s 0 2018-02-27 1 2018-02-28 2 2018-03-01 dtype: datetime64[ns] >>> s.dt.is_month_start 0 False 1 False 2 True dtype: bool >>> s.dt.is_month_end 0 False 1 True 2 False dtype: bool
>>> idx = pd.date_range("2018-02-27", periods=3) >>> idx.is_month_start array([False, False, True]) >>> idx.is_month_end array([False, True, False])