Indicates whether the date is the first day of the month.
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])
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