Check if the date is the first day of the quarter.
True if date is first day of the quarter.
See also
Timestamp.is_quarter_endSimilar property indicating the quarter end.
Timestamp.quarterReturn the quarter of the date.
Examples
>>> ts = pd.Timestamp(2020, 3, 14)
>>> ts.is_quarter_start
False
>>> ts = pd.Timestamp(2020, 4, 1)
>>> ts.is_quarter_start
True
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https://pandas.pydata.org/pandas-docs/version/2.3.0/reference/api/pandas.Timestamp.is_quarter_start.html