diff -r c99c527f1186 Lib/_strptime.py --- a/Lib/_strptime.py Mon May 14 18:23:44 2012 +0200 +++ b/Lib/_strptime.py Mon May 14 19:32:59 2012 +0200 @@ -444,8 +444,10 @@ else: tz = value break + leap_year_fix = False if year is None and month == 2 and day == 29: year = 1904 # 1904 is first leap year of 20th century + leap_year_fix = True elif year is None: year = 1900 # If we know the week of the year and what day of that week, we can figure @@ -476,6 +478,12 @@ else: gmtoff = None + if leap_year_fix: + # the caller didn't supply a year but asked for Feb 29th. We couldn't + # use the default of 1900 for computations. We set it back to ensure + # that February 29th is smaller than March 1st. + year = 1900 + return (year, month, day, hour, minute, second, weekday, julian, tz, gmtoff, tzname), fraction diff -r c99c527f1186 Lib/test/test_strptime.py --- a/Lib/test/test_strptime.py Mon May 14 18:23:44 2012 +0200 +++ b/Lib/test/test_strptime.py Mon May 14 19:32:59 2012 +0200 @@ -381,6 +381,11 @@ def test_feb29_on_leap_year_without_year(self): time.strptime("Feb 29", "%b %d") + def test_mar1_comes_after_feb29_even_when_omitting_the_year(self): + self.assertLess( + time.strptime("Feb 29", "%b %d"), + time.strptime("Mar 1", "%b %d")) + class Strptime12AMPMTests(unittest.TestCase): """Test a _strptime regression in '%I %p' at 12 noon (12 PM)"""