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Fix ISO week-date parsing for years before 1000 #1078

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Fix ISO week-date parsing for years before 1000 #1078

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3 changes: 2 additions & 1 deletion src/pendulum/parsing/iso8601.py
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Original file line number Diff line number Diff line change
Expand Up @@ -447,7 +447,8 @@ def _get_iso_8601_week(
year += 1

fmt = "%Y-%j"
string = f"{year}-{ordinal}"
# %Y matches exactly four digits; years below 1000 must be zero-padded.
string = f"{year:04d}-{ordinal}"

dt = datetime.datetime.strptime(string, fmt)

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7 changes: 7 additions & 0 deletions tests/parsing/test_parse_iso8601.py
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Expand Up @@ -29,6 +29,13 @@
("2008-W39-6", date(2008, 9, 27)),
("2009-W53-7", date(2010, 1, 3)),
("2009-W01-1", date(2008, 12, 29)),
# Week dates with years below 1000 (%Y needs four digits)
("1000-W34-6", date(1000, 8, 23)),
("0999-W34-6", date(999, 8, 24)),
("0416-W34-6", date(416, 8, 27)),
("0416W346", date(416, 8, 27)),
("0416-W34", date(416, 8, 22)),
("0004-W10-5", date(4, 3, 5)),
# Time
("12:34", time(12, 34, 0)),
("12:34:56", time(12, 34, 56)),
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