in getClosestDate(), if date is not passed, timezone of target_date should be respected.

product/ERP5Type/DateUtils.py

@@ -160,10 +160,11 @@ def getClosestDate(date=None, target_date=None,
     -> return DateTime('2004/02/14')
 
   """
-  if date is None:
-    date = DateTime('2000/01/01')
   if target_date is None:
     target_date = DateTime()
+  if date is None:
+    date = DateTime('2000/01/01')
+    date._tz = target_date._tz
 
   earlier_target_date = target_date - millis
 

product/ERP5Type/tests/testDateUtils.py

@@ -54,7 +54,9 @@ ZopeTestCase.installProduct('ERP5Type')
 
 
 from DateTime import DateTime
-from Products.ERP5Type.DateUtils import addToDate, getIntervalListBetweenDates, atTheEndOfPeriod
+
+from Products.ERP5Type.DateUtils import addToDate, getIntervalListBetweenDates, \
+    atTheEndOfPeriod, getClosestDate
 
 class TestDateUtils(unittest.TestCase):
   """
@@ -186,6 +188,18 @@ class TestDateUtils(unittest.TestCase):
     self.assertEqual('Nov. 1, 2008 12:00 am US/Eastern',
       atTheEndOfPeriod(DateTime('2008/10/01 US/Eastern'), 'month').pCommonZ())
 
+  def test_getClosestDate(self):
+    target_date = DateTime('2008/08/15 00:00:00 GMT+2')
+    self.assertEqual('Aug. 1, 2008 12:00 am GMT+2',
+      getClosestDate(target_date=target_date, precision='month', before=True).pCommonZ())
+    self.assertEqual('Sep. 1, 2008 12:00 am GMT+2',
+      getClosestDate(target_date=target_date, precision='month', before=False).pCommonZ())
+    date = DateTime('2008/01/10 00:00:00 GMT-2')
+    self.assertEqual('Aug. 10, 2008 12:00 am GMT-2',
+      getClosestDate(date=date, target_date=target_date, precision='month', before=True).pCommonZ())
+    self.assertEqual('Sep. 10, 2008 12:00 am GMT-2',
+      getClosestDate(date=date, target_date=target_date, precision='month', before=False).pCommonZ())
+
 def test_suite():
   suite = unittest.TestSuite()
   suite.addTest(unittest.makeSuite(TestDateUtils))