[1.1.X] Fixed #12524 -- Clarified handling of pre-1000AD dates in datetime_safe (and thus, the serializers). Patch includes moving the datetime_safe tests into the utils regressiontests module. Thanks to gsf for the report and initial patch.

Backport of r12423 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12424 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/utils/datetime_safe.py

@@ -4,7 +4,7 @@
 #
 # Based on code submitted to comp.lang.python by Andrew Dalke
 #
-# >>> datetime_safe.date(1850, 8, 2).strftime("%Y/%M/%d was a %A")
+# >>> datetime_safe.date(1850, 8, 2).strftime("%Y/%m/%d was a %A")
 # '1850/08/02 was a Friday'
 
 from datetime import date as real_date, datetime as real_datetime
@@ -83,7 +83,7 @@ def strftime(dt, fmt):
             sites.append(site)
 
     s = s1
-    syear = "%4d" % (dt.year,)
+    syear = "%04d" % (dt.year,)
     for site in sites:
         s = s[:site] + syear + s[site+4:]
     return s

tests/modeltests/serializers/models.py

@@ -277,6 +277,21 @@ None
 >>> print obj
 <DeserializedObject: Soslan Djanaev (1) playing for Spartak Moskva>
 
+# Regression for #12524 -- dates before 1000AD get prefixed 0's on the year
+>>> a = Article.objects.create(
+...     pk=4,
+...     author = jane,
+...     headline = "Nobody remembers the early years",
+...     pub_date = datetime(1, 2, 3, 4, 5, 6))
+
+>>> serialized = serializers.serialize("json", [a])
+>>> print serialized
+[{"pk": 4, "model": "serializers.article", "fields": {"headline": "Nobody remembers the early years", "pub_date": "0001-02-03 04:05:06", "categories": [], "author": 2}}]
+
+>>> obj = list(serializers.deserialize("json", serialized))[0]
+>>> print obj.object.pub_date
+0001-02-03 04:05:06
+
 """}
 
 try:

tests/regressiontests/utils/datetime_safe.py

@@ -1,4 +1,4 @@
-r"""
+"""
 >>> from datetime import date as original_date, datetime as original_datetime
 >>> from django.utils.datetime_safe import date, datetime
 >>> just_safe = (1900, 1, 1)
@@ -34,4 +34,11 @@ True
 '00'
 >>> datetime(*just_safe).strftime('%y')
 '00'
+
+>>> date(1850, 8, 2).strftime("%Y/%m/%d was a %A")
+'1850/08/02 was a Friday'
+
+# Regression for #12524 -- Check that pre-1000AD dates are padded with zeros if necessary
+>>> date(1, 1, 1).strftime("%Y/%m/%d was a %A")
+'0001/01/01 was a Monday'
 """

tests/regressiontests/utils/tests.py

@@ -10,6 +10,7 @@ from django.utils.functional import SimpleLazyObject
 import timesince
 import datastructures
 import dateformat
+import datetime_safe
 import itercompat
 from decorators import DecoratorFromMiddlewareTests
 from functional import FunctionalTestCase
@@ -25,6 +26,7 @@ except NameError:
 __test__ = {
     'timesince': timesince,
     'datastructures': datastructures,
+    'datetime_safe': datetime_safe,
     'itercompat': itercompat,
 }