pandas.arrays.DatetimeArray.is_month_start — pandas 0.24.0rc1 documentation (original) (raw)
DatetimeArray. is_month_start¶
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. |
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See also
Return a boolean indicating whether the date is the first day of the month.
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])