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.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12423 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/utils/datetime_safe.py

@@ -0,0 +1,44 @@
+"""
+>>> from datetime import date as original_date, datetime as original_datetime
+>>> from django.utils.datetime_safe import date, datetime
+>>> just_safe = (1900, 1, 1)
+>>> just_unsafe = (1899, 12, 31, 23, 59, 59)
+>>> really_old = (20, 1, 1)
+>>> more_recent = (2006, 1, 1)
+
+>>> original_datetime(*more_recent) == datetime(*more_recent)
+True
+>>> original_datetime(*really_old) == datetime(*really_old)
+True
+>>> original_date(*more_recent) == date(*more_recent)
+True
+>>> original_date(*really_old) == date(*really_old)
+True
+
+>>> original_date(*just_safe).strftime('%Y-%m-%d') == date(*just_safe).strftime('%Y-%m-%d')
+True
+>>> original_datetime(*just_safe).strftime('%Y-%m-%d') == datetime(*just_safe).strftime('%Y-%m-%d')
+True
+
+>>> date(*just_unsafe[:3]).strftime('%Y-%m-%d (weekday %w)')
+'1899-12-31 (weekday 0)'
+>>> date(*just_safe).strftime('%Y-%m-%d (weekday %w)')
+'1900-01-01 (weekday 1)'
+
+>>> datetime(*just_unsafe).strftime('%Y-%m-%d %H:%M:%S (weekday %w)')
+'1899-12-31 23:59:59 (weekday 0)'
+>>> datetime(*just_safe).strftime('%Y-%m-%d %H:%M:%S (weekday %w)')
+'1900-01-01 00:00:00 (weekday 1)'
+
+>>> date(*just_safe).strftime('%y')   # %y will error before this date
+'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'
+"""