Issue #23718: Fixed parsing time in week 0 before Jan 1. Original patch by
Tamás Bence Gedai.
diff --git a/Lib/_strptime.py b/Lib/_strptime.py
index 63dca02..feac05a 100644
--- a/Lib/_strptime.py
+++ b/Lib/_strptime.py
@@ -445,6 +445,10 @@
week_starts_Mon = True if week_of_year_start == 0 else False
julian = _calc_julian_from_U_or_W(year, week_of_year, weekday,
week_starts_Mon)
+ if julian <= 0:
+ year -= 1
+ yday = 366 if calendar.isleap(year) else 365
+ julian += yday
# Cannot pre-calculate datetime_date() since can change in Julian
# calculation and thus could have different value for the day of the week
# calculation.
diff --git a/Lib/test/test_strptime.py b/Lib/test/test_strptime.py
index a3ab426..3d24941 100644
--- a/Lib/test/test_strptime.py
+++ b/Lib/test/test_strptime.py
@@ -486,14 +486,14 @@
def test_week_0(self):
def check(value, format, *expected):
self.assertEqual(_strptime._strptime_time(value, format)[:-1], expected)
- check('2015 0 0', '%Y %U %w', 2014, 12, 28, 0, 0, 0, 6, -3)
+ check('2015 0 0', '%Y %U %w', 2014, 12, 28, 0, 0, 0, 6, 362)
check('2015 0 0', '%Y %W %w', 2015, 1, 4, 0, 0, 0, 6, 4)
- check('2015 0 1', '%Y %U %w', 2014, 12, 29, 0, 0, 0, 0, -2)
- check('2015 0 1', '%Y %W %w', 2014, 12, 29, 0, 0, 0, 0, -2)
- check('2015 0 2', '%Y %U %w', 2014, 12, 30, 0, 0, 0, 1, -1)
- check('2015 0 2', '%Y %W %w', 2014, 12, 30, 0, 0, 0, 1, -1)
- check('2015 0 3', '%Y %U %w', 2014, 12, 31, 0, 0, 0, 2, 0)
- check('2015 0 3', '%Y %W %w', 2014, 12, 31, 0, 0, 0, 2, 0)
+ check('2015 0 1', '%Y %U %w', 2014, 12, 29, 0, 0, 0, 0, 363)
+ check('2015 0 1', '%Y %W %w', 2014, 12, 29, 0, 0, 0, 0, 363)
+ check('2015 0 2', '%Y %U %w', 2014, 12, 30, 0, 0, 0, 1, 364)
+ check('2015 0 2', '%Y %W %w', 2014, 12, 30, 0, 0, 0, 1, 364)
+ check('2015 0 3', '%Y %U %w', 2014, 12, 31, 0, 0, 0, 2, 365)
+ check('2015 0 3', '%Y %W %w', 2014, 12, 31, 0, 0, 0, 2, 365)
check('2015 0 4', '%Y %U %w', 2015, 1, 1, 0, 0, 0, 3, 1)
check('2015 0 4', '%Y %W %w', 2015, 1, 1, 0, 0, 0, 3, 1)
check('2015 0 5', '%Y %U %w', 2015, 1, 2, 0, 0, 0, 4, 2)
@@ -501,6 +501,20 @@
check('2015 0 6', '%Y %U %w', 2015, 1, 3, 0, 0, 0, 5, 3)
check('2015 0 6', '%Y %W %w', 2015, 1, 3, 0, 0, 0, 5, 3)
+ check('2009 0 0', '%Y %U %w', 2008, 12, 28, 0, 0, 0, 6, 363)
+ check('2009 0 0', '%Y %W %w', 2009, 1, 4, 0, 0, 0, 6, 4)
+ check('2009 0 1', '%Y %U %w', 2008, 12, 29, 0, 0, 0, 0, 364)
+ check('2009 0 1', '%Y %W %w', 2008, 12, 29, 0, 0, 0, 0, 364)
+ check('2009 0 2', '%Y %U %w', 2008, 12, 30, 0, 0, 0, 1, 365)
+ check('2009 0 2', '%Y %W %w', 2008, 12, 30, 0, 0, 0, 1, 365)
+ check('2009 0 3', '%Y %U %w', 2008, 12, 31, 0, 0, 0, 2, 366)
+ check('2009 0 3', '%Y %W %w', 2008, 12, 31, 0, 0, 0, 2, 366)
+ check('2009 0 4', '%Y %U %w', 2009, 1, 1, 0, 0, 0, 3, 1)
+ check('2009 0 4', '%Y %W %w', 2009, 1, 1, 0, 0, 0, 3, 1)
+ check('2009 0 5', '%Y %U %w', 2009, 1, 2, 0, 0, 0, 4, 2)
+ check('2009 0 5', '%Y %W %w', 2009, 1, 2, 0, 0, 0, 4, 2)
+ check('2009 0 6', '%Y %U %w', 2009, 1, 3, 0, 0, 0, 5, 3)
+ check('2009 0 6', '%Y %W %w', 2009, 1, 3, 0, 0, 0, 5, 3)
class CacheTests(unittest.TestCase):
"""Test that caching works properly."""