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BUG: pandas-dev#58523 & pandas-dev#58524 #58545

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BUG: pandas-dev#58523 & pandas-dev#58524 #58545

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020f5a3
BUG: DatetimeIndex.is_year_start breaks on double-digit frequencies #…
VISWESWARAN1998 May 2, 2024
8df36f7
May fix #58523 & #58524
VISWESWARAN1998 May 2, 2024
bc13a40
Merge branch 'pandas-dev:main' into DT
VISWESWARAN1998 May 3, 2024
443724e
Fixing the failed test case
VISWESWARAN1998 May 3, 2024
663acb2
Merge branch 'DT' of https://github.com/VISWESWARAN1998/pandas into DT
VISWESWARAN1998 May 3, 2024
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10 changes: 5 additions & 5 deletions pandas/_libs/tslibs/fields.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -246,15 +246,15 @@ def get_start_end_field(
if freqstr:
if freqstr == "C":
raise ValueError(f"Custom business days is not supported by {field}")
is_business = freqstr[0] == "B"

period_str = "".join([
dt_char for dt_char in list(freqstr.split("-")[0]) if not dt_char.isdigit()
])
is_business = period_str.startswith("B")
# YearBegin(), BYearBegin() use month = starting month of year.
# QuarterBegin(), BQuarterBegin() use startingMonth = starting
# month of year. Other offsets use month, startingMonth as ending
# month of year.

if (freqstr[0:2] in ["MS", "QS", "YS"]) or (
freqstr[1:3] in ["MS", "QS", "YS"]):
if (period_str in ["MS", "QS", "YS"]):
end_month = 12 if month_kw == 1 else month_kw - 1
start_month = month_kw
else:
Expand Down