Return boolean whether a timestamp occurs on the quarter start.
Examples
>>> ts = pd.Timestamp(2022, 1, 1) >>> freq = pd.offsets.Hour(5) >>> freq.is_quarter_start(ts) True
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pandas.tseries.offsets.BQuarterBegin.is_quarter_end
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pandas.tseries.offsets.BQuarterBegin.is_year_end