Fixed #6023 -- Fixed daylight savings determination for years beyond 2038 on

32-bit systems (modulo the fact that the system timezone libraries might not be
accurate that far out; at least we don't crash now). Thanks, SmileyChris.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@6749 bcc190cf-cafb-0310-a4f2-bffc1f526a37

2 files changed, 11 insertions, 1 deletions

diff --git a/django/utils/tzinfo.py b/django/utils/tzinfo.py
index e2e1d10fc1..7d5ead9290 100644
--- a/django/utils/tzinfo.py
+++ b/django/utils/tzinfo.py
@@ -54,6 +54,12 @@ class LocalTimezone(tzinfo):
 
     def _isdst(self, dt):
         tt = (dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second, dt.weekday(), 0, -1)
-        stamp = time.mktime(tt)
+        try:
+            stamp = time.mktime(tt)
+        except OverflowError:
+            # 32 bit systems can't handle dates after Jan 2038, so we fake it
+            # in that case (since we only care about the DST flag here).
+            tt = (2037,) + tt[1:]
+            stamp = time.mktime(tt)
         tt = time.localtime(stamp)
         return tt.tm_isdst > 0
diff --git a/tests/regressiontests/dateformat/tests.py b/tests/regressiontests/dateformat/tests.py
index 30c9a4e6dd..481e36a7dd 100644
--- a/tests/regressiontests/dateformat/tests.py
+++ b/tests/regressiontests/dateformat/tests.py
@@ -66,6 +66,9 @@ u'1979 189 CET'
 
 >>> format(my_birthday, r'jS o\f F')
 u'8th of July'
+
+>>> format(the_future, r'Y')
+u'2100'
 """
 
 from django.utils import dateformat, translation
@@ -84,3 +87,4 @@ except AttributeError:
 my_birthday = datetime.datetime(1979, 7, 8, 22, 00)
 summertime = datetime.datetime(2005, 10, 30, 1, 00)
 wintertime = datetime.datetime(2005, 10, 30, 4, 00)
+the_future = datetime.datetime(2100, 10, 25, 0, 00)