diff --git a/addons/account/report/account_report.py b/addons/account/report/account_report.py
index 362d0adb414..b7d3441913f 100644
--- a/addons/account/report/account_report.py
+++ b/addons/account/report/account_report.py
@@ -20,9 +20,8 @@
 ##############################################################################
 
 import time
-import datetime
-import mx.DateTime
-
+from datetime import datetime
+from dateutil.relativedelta import relativedelta
 import pooler
 import tools
 from osv import fields,osv
@@ -128,13 +127,13 @@ class report_aged_receivable(osv.osv):
         LIST_RANGES = []
         if fy_id:
             fy_start_date = pool_obj_fy.read(cr, uid, fy_id, ['date_start'])['date_start']
-            fy_start_date = mx.DateTime.strptime(fy_start_date, '%Y-%m-%d')
-            last_month_date = mx.DateTime.strptime(today, '%Y-%m-%d') - mx.DateTime.RelativeDateTime(months=1)
+            fy_start_date = datetime.strptime(fy_start_date, '%Y-%m-%d')
+            last_month_date = datetime.strptime(today, '%Y-%m-%d') - relativedelta(months=1)
 
             while (last_month_date > fy_start_date):
                 LIST_RANGES.append(today + " to " + last_month_date.strftime('%Y-%m-%d'))
                 today = (last_month_date- 1).strftime('%Y-%m-%d')
-                last_month_date = mx.DateTime.strptime(today, '%Y-%m-%d') - mx.DateTime.RelativeDateTime(months=1)
+                last_month_date = datetime.strptime(today, '%Y-%m-%d') - relativedelta(months=1)
 
             LIST_RANGES.append(today +" to " + fy_start_date.strftime('%Y-%m-%d'))
             cr.execute('delete from temp_range')
diff --git a/addons/account/wizard/account_report_aged_partner_balance.py b/addons/account/wizard/account_report_aged_partner_balance.py
index 99983654c82..10548095131 100644
--- a/addons/account/wizard/account_report_aged_partner_balance.py
+++ b/addons/account/wizard/account_report_aged_partner_balance.py
@@ -20,8 +20,8 @@
 ##############################################################################
 
 import time
-import datetime
-from mx.DateTime import *
+from datetime import datetime
+from dateutil.relativedelta import relativedelta
 from lxml import etree
 
 from osv import osv, fields
@@ -69,26 +69,26 @@ class account_aged_trial_balance(osv.osv_memory):
         if not data['form']['date_from']:
             raise osv.except_osv(_('UserError'), _('Enter a Start date !'))
 
-        start = datetime.date.fromtimestamp(time.mktime(time.strptime(data['form']['date_from'], "%Y-%m-%d")))
-        start = DateTime(int(start.year), int(start.month), int(start.day))
+        start = datetime.strptime(data['form']['date_from'], "%Y-%m-%d")
+        
         if data['form']['direction_selection'] == 'past':
             for i in range(5)[::-1]:
-                stop = start - RelativeDateTime(days=period_length)
+                stop = start - relativedelta(days=period_length)
                 res[str(i)] = {
                     'name': (i!=0 and (str((5-(i+1)) * period_length) + '-' + str((5-i) * period_length)) or ('+'+str(4 * period_length))),
                     'stop': start.strftime('%Y-%m-%d'),
                     'start': (i!=0 and stop.strftime('%Y-%m-%d') or False),
                 }
-                start = stop - RelativeDateTime(days=1)
+                start = stop - relativedelta(days=1)
         else:
             for i in range(5):
-                stop = start + RelativeDateTime(days=period_length)
+                stop = start + relativedelta(days=period_length)
                 res[str(5-(i+1))] = {
                     'name' : (i!=4 and str((i) * period_length)+'-' + str((i+1) * period_length) or ('+'+str(4 * period_length))),
                     'start': start.strftime('%Y-%m-%d'),
                     'stop': (i!=4 and stop.strftime('%Y-%m-%d') or False),
                 }
-                start = stop + RelativeDateTime(days=1)
+                start = stop + relativedelta(days=1)
         data['form'].update(res)
 
         return {
diff --git a/addons/account_report/account.py b/addons/account_report/account.py
index 5dffc0c6a78..6e5fbc94026 100644
--- a/addons/account_report/account.py
+++ b/addons/account_report/account.py
@@ -26,9 +26,6 @@ import pooler
 from tools.misc import currency
 from tools.translate import _
 
-import mx.DateTime
-from mx.DateTime import RelativeDateTime, now, DateTime, localtime
-
 
 class account_report(osv.osv):
     _name = "account.report.report"
diff --git a/addons/account_report/wizard/account_report_print_indicators_with_pdf.py b/addons/account_report/wizard/account_report_print_indicators_with_pdf.py
index 9e71d3e88c9..2ae373e58f0 100644
--- a/addons/account_report/wizard/account_report_print_indicators_with_pdf.py
+++ b/addons/account_report/wizard/account_report_print_indicators_with_pdf.py
@@ -19,7 +19,6 @@
 #
 ##############################################################################
 import time
-from mx.DateTime import *
 import os
 import base64
 import StringIO
diff --git a/addons/account_reporting/account.py b/addons/account_reporting/account.py
index c1c68f04d9b..7fc08401496 100644
--- a/addons/account_reporting/account.py
+++ b/addons/account_reporting/account.py
@@ -24,9 +24,6 @@ from osv import fields, osv
 
 from tools.misc import currency
 
-import mx.DateTime
-from mx.DateTime import RelativeDateTime, now, DateTime, localtime
-
 
 class color_rml(osv.osv):
     _name = "color.rml"
diff --git a/addons/base_calendar/wizard/base_calendar_set_exrule.py b/addons/base_calendar/wizard/base_calendar_set_exrule.py
index ab458c8f7f5..995d2a98dcc 100644
--- a/addons/base_calendar/wizard/base_calendar_set_exrule.py
+++ b/addons/base_calendar/wizard/base_calendar_set_exrule.py
@@ -23,7 +23,6 @@ from base_calendar import base_calendar
 from osv import fields, osv
 from tools.translate import _
 import tools
-import mx.DateTime
 import re
 
 
diff --git a/addons/crm/crm_lead.py b/addons/crm/crm_lead.py
index 0a552a4165a..c15307530f1 100644
--- a/addons/crm/crm_lead.py
+++ b/addons/crm/crm_lead.py
@@ -23,7 +23,6 @@ from osv import fields, osv
 from datetime import datetime
 import crm
 import time
-import mx.DateTime
 from tools.translate import _
 from crm import crm_case
 import binascii
@@ -84,12 +83,12 @@ class crm_lead(crm_case, osv.osv):
                         new_dates = cal_obj.interval_get(cr,
                             uid,
                             lead.section_id.resource_calendar_id and lead.section_id.resource_calendar_id.id or False,
-                            mx.DateTime.strptime(lead.create_date, '%Y-%m-%d %H:%M:%S'),
+                            datetime.strptime(lead.create_date, '%Y-%m-%d %H:%M:%S'),
                             duration,
                             resource=resource_id
                         )
                         no_days = []
-                        date_until = mx.DateTime.strptime(date_until, '%Y-%m-%d %H:%M:%S')
+                        date_until = datetime.strptime(date_until, '%Y-%m-%d %H:%M:%S')
                         for in_time, out_time in new_dates:
                             if in_time.date not in no_days:
                                 no_days.append(in_time.date)
diff --git a/addons/crm/crm_opportunity.py b/addons/crm/crm_opportunity.py
index 84e1392168f..771212a171d 100644
--- a/addons/crm/crm_opportunity.py
+++ b/addons/crm/crm_opportunity.py
@@ -24,7 +24,6 @@ from osv import fields,osv,orm
 from tools.translate import _
 import crm
 import time
-import mx.DateTime
 
 AVAILABLE_STATES = [
     ('draft','Draft'),
diff --git a/addons/document_ics/document_ics_config_wizard.py b/addons/document_ics/document_ics_config_wizard.py
index 611c804a62c..51ccab59204 100644
--- a/addons/document_ics/document_ics_config_wizard.py
+++ b/addons/document_ics/document_ics_config_wizard.py
@@ -23,7 +23,6 @@ import time
 import tools
 from osv import fields, osv, orm
 import os
-import mx.DateTime
 import base64
 import pooler
 
diff --git a/addons/hr_attendance/report/attendance_by_month.py b/addons/hr_attendance/report/attendance_by_month.py
index 650df0048bf..a4a50f61320 100644
--- a/addons/hr_attendance/report/attendance_by_month.py
+++ b/addons/hr_attendance/report/attendance_by_month.py
@@ -19,9 +19,9 @@
 #
 ##############################################################################
 
-from mx import DateTime
-from mx.DateTime import now
 import time
+from datetime import datetime
+from dateutil.relativedelta import relativedelta
 import datetime
 import netsvc
 import pooler
@@ -31,7 +31,7 @@ from report.interface import toxml
 
 from report import report_sxw
 
-one_day = DateTime.RelativeDateTime(days=1)
+one_day = relativedelta(days=1)
 month2name = [0, 'January', 'February', 'March', 'April', 'May', 'Jun', 'July', 'August', 'September', 'October', 'November', 'December']
 
 #def hour2str(h):
@@ -57,7 +57,7 @@ class report_custom(report_rml):
         obj_emp = pooler.get_pool(cr.dbname).get('hr.employee')
         if context is None:
             context = {}
-        month = DateTime.DateTime(datas['form']['year'], datas['form']['month'], 1)
+        month = datetime(datas['form']['year'], datas['form']['month'], 1)
         emp_ids = context.get('active_ids', [])
         user_xml = ['<month>%s</month>' % month2name[month.month], '<year>%s</year>' % month.year]
         if emp_ids:
@@ -89,7 +89,7 @@ class report_custom(report_rml):
                         attendences.append({'name': tomor.strftime('%Y-%m-%d %H:%M:%S'), 'action':'sign_out'})
                     # sum up the attendances' durations
                     for att in attendences:
-                        dt = DateTime.strptime(att['name'], '%Y-%m-%d %H:%M:%S')
+                        dt = datetime.strptime(att['name'], '%Y-%m-%d %H:%M:%S')
                         if att['action'] == 'sign_out':
                             wh += (dt - ldt).hours
                         ldt = dt
diff --git a/addons/hr_attendance/report/timesheet.py b/addons/hr_attendance/report/timesheet.py
index 94dc1edcbbd..1465be81bc8 100644
--- a/addons/hr_attendance/report/timesheet.py
+++ b/addons/hr_attendance/report/timesheet.py
@@ -19,16 +19,16 @@
 #
 ##############################################################################
 
-from mx import DateTime
-from mx.DateTime import now
 
+from datetime import datetime
+from dateutil.relativedelta import relativedelta
 
 import pooler
 
 from report.interface import report_rml
 from report.interface import toxml
 
-one_week = DateTime.RelativeDateTime(days=7)
+one_week = relativedelta(days=7)
 num2day = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']
 
 def to_hour(h):
@@ -38,10 +38,12 @@ class report_custom(report_rml):
 
     def create_xml(self, cr, uid, ids, datas, context=None):
         obj_emp = pooler.get_pool(cr.dbname).get('hr.employee')
-        start_date = DateTime.strptime(datas['form']['init_date'], '%Y-%m-%d')
-        end_date = DateTime.strptime(datas['form']['end_date'], '%Y-%m-%d')
-        first_monday = start_date - DateTime.RelativeDateTime(days=start_date.day_of_week)
-        last_monday = end_date + DateTime.RelativeDateTime(days=7 - end_date.day_of_week)
+        
+        start_date = datetime.strptime(datas['form']['init_date'], '%Y-%m-%d')
+        end_date = datetime.strptime(datas['form']['end_date'], '%Y-%m-%d')
+        first_monday = start_date - relativedelta(days=start_date.day_of_week)
+        last_monday = end_date + relativedelta(days=7 - end_date.day_of_week)
+        
         if last_monday < first_monday:
             first_monday, last_monday = last_monday, first_monday
 
@@ -67,7 +69,7 @@ class report_custom(report_rml):
                 order by att.name
                 '''
                 for idx in range(7):
-                    cr.execute(sql, (monday.strftime('%Y-%m-%d %H:%M:%S'), (monday + DateTime.RelativeDateTime(days=idx+1)).strftime('%Y-%m-%d %H:%M:%S'), employee_id))
+                    cr.execute(sql, (monday.strftime('%Y-%m-%d %H:%M:%S'), (monday + relativedelta(days=idx+1)).strftime('%Y-%m-%d %H:%M:%S'), employee_id))
                     attendances = cr.dictfetchall()
                     week_wh = {}
                     # Fake sign ins/outs at week ends, to take attendances across week ends into account
@@ -78,7 +80,7 @@ class report_custom(report_rml):
                         attendances.append({'name': n_monday.strftime('%Y-%m-%d %H:%M:%S'), 'action': 'sign_out'})
                     # sum up the attendances' durations
                     for att in attendances:
-                        dt = DateTime.strptime(att['name'], '%Y-%m-%d %H:%M:%S')
+                        dt = datetime.strptime(att['name'], '%Y-%m-%d %H:%M:%S')
                         if att['action'] == 'sign_out':
                             week_wh[ldt.day_of_week] = week_wh.get(ldt.day_of_week, 0) + (dt - ldt).hours
                         ldt = dt
diff --git a/addons/hr_payroll/report/report_emp_salary_structure.py b/addons/hr_payroll/report/report_emp_salary_structure.py
index d4365a8423b..7deafcf63e4 100644
--- a/addons/hr_payroll/report/report_emp_salary_structure.py
+++ b/addons/hr_payroll/report/report_emp_salary_structure.py
@@ -23,7 +23,6 @@
 ##############################################################################
 
 import time
-import mx.DateTime
 from report import report_sxw
 from tools import amount_to_text_en
 
diff --git a/addons/hr_payroll/report/report_employees_detail.py b/addons/hr_payroll/report/report_employees_detail.py
index ca06af969e7..5a9f25afa9f 100644
--- a/addons/hr_payroll/report/report_employees_detail.py
+++ b/addons/hr_payroll/report/report_employees_detail.py
@@ -5,8 +5,6 @@ from report import report_sxw
 import time
 import pooler
 import rml_parse
-import mx.DateTime
-from mx.DateTime import RelativeDateTime, now, DateTime, localtime
 
 class employees_salary_report(rml_parse.rml_parse):
 
diff --git a/addons/hr_payroll/report/report_payroll_advice.py b/addons/hr_payroll/report/report_payroll_advice.py
index 2f4d82c263b..1c7fbd91357 100644
--- a/addons/hr_payroll/report/report_payroll_advice.py
+++ b/addons/hr_payroll/report/report_payroll_advice.py
@@ -1,5 +1,5 @@
 import time
-import mx.DateTime
+from datetime import datetime
 from report import report_sxw
 from tools import amount_to_text_en
 
@@ -22,7 +22,7 @@ class payroll_advice_report(report_sxw.rml_parse):
         res = {
                'mname':''
                }
-        date = mx.DateTime.strptime(input_date, '%Y-%m-%d')
+        date = datetime.strptime(input_date, '%Y-%m-%d')
         res['mname']= date.strftime('%B')+'-'+date.strftime('%Y')
         return res
 
diff --git a/addons/hr_payroll/report/report_payroll_register.py b/addons/hr_payroll/report/report_payroll_register.py
index 6ab5b0c35c9..b146e2900af 100644
--- a/addons/hr_payroll/report/report_payroll_register.py
+++ b/addons/hr_payroll/report/report_payroll_register.py
@@ -1,5 +1,5 @@
 import time
-import mx.DateTime
+from datetime import datetime
 from report import report_sxw
 from tools import amount_to_text_en
 
@@ -56,7 +56,7 @@ class report_payroll_register(report_sxw.rml_parse):
         return self.net
         
     def get_month(self, indate):
-        new_date = mx.DateTime.strptime(indate, '%Y-%m-%d')
+        new_date = datetime.strptime(indate, '%Y-%m-%d')
         out_date = new_date.strftime('%B')+'-'+new_date.strftime('%Y')
         return out_date
 
diff --git a/addons/hr_payroll/report/report_payslip.py b/addons/hr_payroll/report/report_payslip.py
index 4fc9410861d..e818e0f3727 100755
--- a/addons/hr_payroll/report/report_payslip.py
+++ b/addons/hr_payroll/report/report_payslip.py
@@ -23,7 +23,7 @@
 ##############################################################################
 
 import time
-import mx.DateTime
+from datetime import datetime
 from report import report_sxw
 from tools import amount_to_text_en
 
@@ -93,7 +93,7 @@ class payslip_report(report_sxw.rml_parse):
            res = {
                     'mname':''
                  }
-           date = mx.DateTime.strptime(obj.date, '%Y-%m-%d')
+           date = datetime.strptime(obj.date, '%Y-%m-%d')
            res['mname']= date.strftime('%B')+"-"+date.strftime('%Y')
            return res['mname']
 
diff --git a/addons/hr_payroll/report/report_year_salary.py b/addons/hr_payroll/report/report_year_salary.py
index 66cf05db601..31dae5abffe 100755
--- a/addons/hr_payroll/report/report_year_salary.py
+++ b/addons/hr_payroll/report/report_year_salary.py
@@ -5,8 +5,6 @@ from report import report_sxw
 import time
 import pooler
 import rml_parse
-import mx.DateTime
-from mx.DateTime import RelativeDateTime, now, DateTime, localtime
 
 class year_salary_report(rml_parse.rml_parse):
     
diff --git a/addons/l10n_ch/report/bvr_report.py b/addons/l10n_ch/report/bvr_report.py
index 646806b202f..e0c7ca624a5 100644
--- a/addons/l10n_ch/report/bvr_report.py
+++ b/addons/l10n_ch/report/bvr_report.py
@@ -35,7 +35,7 @@ import os
 import sys
 import shutil
 import time
-from mx.DateTime import *
+from datetime import datetime
 
 from report import report_sxw
 from tools import mod10r
diff --git a/addons/l10n_ch/wizard/create_dta.py b/addons/l10n_ch/wizard/create_dta.py
index 8bde159013a..d3e2856387d 100644
--- a/addons/l10n_ch/wizard/create_dta.py
+++ b/addons/l10n_ch/wizard/create_dta.py
@@ -31,7 +31,7 @@
 ##############################################################################
 
 import time
-import mx.DateTime
+from datetime import datetime
 import base64
 
 from osv import osv, fields
@@ -469,11 +469,11 @@ def _create_dta(obj, cr, uid, data, context=None):
                     'on line: ' + pline.name)
 
         if pline.order_id.date_scheduled:
-            date_value = mx.DateTime.strptime(pline.order_id.date_scheduled, '%Y-%m-%d')
+            date_value = datetime.strptime(pline.order_id.date_scheduled, '%Y-%m-%d')
         elif pline.date:
-            date_value = mx.DateTime.strptime(pline.date, '%Y-%m-%d')
+            date_value = datetime.strptime(pline.date, '%Y-%m-%d')
         else:
-            date_value = mx.DateTime.now()
+            date_value = datetime.now()
         v['date_value'] = date_value.strftime("%y%m%d")
 
         # si compte iban -> iban (836)
diff --git a/addons/mrp/report/workcenter_load.py b/addons/mrp/report/workcenter_load.py
index 473dedd9d1a..15e94bd6f4c 100644
--- a/addons/mrp/report/workcenter_load.py
+++ b/addons/mrp/report/workcenter_load.py
@@ -23,8 +23,12 @@ from report.render import render
 from report.interface import report_int
 from pychart import *
 from mx.DateTime import *
+import time
+from datetime import datetime
+from dateutil.relativedelta import relativedelta
+
 from report.misc import choice_colors
-import time, mx
+
 import random
 import StringIO
 
@@ -62,8 +66,8 @@ class report_custom(report_int):
                 months = {1:"January",2:"February",3:"March",4:"April",5:"May",6:"June",7:"July",8:"August",9:"September",10:"October",11:"November",12:"December"}
                 dates[i] = {
                     'name' :months[month],
-                    'start':(Date(year, month, 2) + RelativeDateTime(day=1)).strftime('%Y-%m-%d'),
-                    'stop' :(Date(year, month, 2) + RelativeDateTime(day=-1)).strftime('%Y-%m-%d'),
+                    'start':(datetime.date(year, month, 2) + relativedelta(day=1)).strftime('%Y-%m-%d'),
+                    'stop' :(datetime.date(year, month, 2) + relativedelta(day=-1)).strftime('%Y-%m-%d'),
                 }
             return dates
         elif time_unit == 'week':
@@ -90,7 +94,7 @@ class report_custom(report_int):
                     'start':i.strftime('%Y-%m-%d'),
                     'stop' :i.strftime('%Y-%m-%d'),
                 }
-                i = i + RelativeDateTime(days=+1)
+                i = i + relativedelta(days=+1)
             return dates
         return {}
 
diff --git a/addons/mrp_repair/mrp_repair.py b/addons/mrp_repair/mrp_repair.py
index 7aafee1a447..af88c32f42a 100644
--- a/addons/mrp_repair/mrp_repair.py
+++ b/addons/mrp_repair/mrp_repair.py
@@ -21,8 +21,8 @@
 
 from osv import fields,osv
 import netsvc
-import mx.DateTime
-from mx.DateTime import RelativeDateTime, today
+from datetime import datetime, date
+from dateutil.relativedelta import relativedelta
 from tools.translate import _
 import decimal_precision as dp
 
@@ -222,8 +222,7 @@ class mrp_repair(osv.osv):
         if move_id:
             move =  self.pool.get('stock.move').browse(cr, uid, move_id)
             product = self.pool.get('product.product').browse(cr, uid, prod_id)
-            date = move.date_planned
-            limit = mx.DateTime.strptime(date, '%Y-%m-%d %H:%M:%S') + RelativeDateTime(months=product.warranty)
+            limit = datetime.strptime(move.date_planned, '%Y-%m-%d %H:%M:%S') + relativedelta(months=product.warranty)
             data['value']['guarantee_limit'] = limit.strftime('%Y-%m-%d')
             data['value']['location_id'] = move.location_dest_id.id
             data['value']['location_dest_id'] = move.location_dest_id.id
@@ -688,7 +687,7 @@ class mrp_repair_line(osv.osv, ProductChangeMixin):
         if type == 'add':
             stock_id = self.pool.get('stock.location').search(cr, uid, [('name','=','Stock')])[0]
             to_invoice = False
-            if guarantee_limit and today() > mx.DateTime.strptime(guarantee_limit, '%Y-%m-%d'):
+            if guarantee_limit and date.today() > datetime.strptime(guarantee_limit, '%Y-%m-%d'):
                 to_invoice=True
             return {'value': {
                         'to_invoice': to_invoice,
diff --git a/addons/project_planning/project_planning.py b/addons/project_planning/project_planning.py
index 2044772e6cc..729a8ee6bbb 100644
--- a/addons/project_planning/project_planning.py
+++ b/addons/project_planning/project_planning.py
@@ -21,7 +21,8 @@
 ##############################################################################
 
 import time
-import mx.DateTime
+from datetime import datetime
+from dateutil.relativedelta import relativedelta
 
 from osv import fields, osv
 from tools.translate import _
@@ -139,7 +140,7 @@ class report_account_analytic_planning(osv.osv):
     }
     _defaults = {
         'date_from': time.strftime('%Y-%m-01'),
-        'date_to': (mx.DateTime.now()+mx.DateTime.RelativeDateTime(months=1, day=1, days=-1)).strftime('%Y-%m-%d'),
+        'date_to': (datetime.now()+relativedelta(months=1, day=1, days=-1)).strftime('%Y-%m-%d'),
         'user_id': lambda self, cr, uid, c: uid,
         'state': 'draft',
         'business_days': 20,
diff --git a/addons/project_timesheet/report/task_report.py b/addons/project_timesheet/report/task_report.py
index ea454519394..261f4e17c64 100644
--- a/addons/project_timesheet/report/task_report.py
+++ b/addons/project_timesheet/report/task_report.py
@@ -18,7 +18,8 @@
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 ##############################################################################
-import mx.DateTime
+from datetime import datetime
+from dateutil.relativedelta import relativedelta
 
 from osv import fields,osv
 import tools
@@ -31,7 +32,7 @@ class report_timesheet_task_user(osv.osv):
     def _get_task_hours(self, cr, uid, ids, name,args,context):
         result = {}
         for record in self.browse(cr, uid, ids,context):
-            last_date = mx.DateTime.strptime(record.name, '%Y-%m-%d') + mx.DateTime.RelativeDateTime(months=1) - 1
+            last_date = datetime(record.name, '%Y-%m-%d') + relativedelta(months=1) - 1
             task_obj=self.pool.get('project.task.work')
             task_ids = task_obj.search(cr, uid, [('user_id','=',record.user_id.id),('date','>=',record.name),('date','<=',last_date.strftime('%Y-%m-%d'))])
             tsk_hrs = task_obj.read(cr, uid, task_ids, ['hours','date','user_id'])
@@ -45,7 +46,7 @@ class report_timesheet_task_user(osv.osv):
         result = {}
         sum = 0.0
         for record in self.browse(cr, uid, ids, context):
-            last_date = mx.DateTime.strptime(record.name, '%Y-%m-%d') + mx.DateTime.RelativeDateTime(months=1) - 1
+            last_date = datetime.strptime(record.name, '%Y-%m-%d') + relativedelta(months=1) - 1
             obj=self.pool.get('hr_timesheet_sheet.sheet.day')
             sheet_ids = obj.search(cr, uid, [('sheet_id.user_id','=',record.user_id.id),('name','>=',record.name),('name','<=',last_date.strftime('%Y-%m-%d'))])
             data_days = obj.read(cr, uid, sheet_ids, ['name','sheet_id.user_id','total_attendance'])
diff --git a/addons/stock_planning/stock_planning.py b/addons/stock_planning/stock_planning.py
index f6668130415..9d08fe3077e 100644
--- a/addons/stock_planning/stock_planning.py
+++ b/addons/stock_planning/stock_planning.py
@@ -20,8 +20,8 @@
 ##############################################################################
 
 import time
-import mx.DateTime
-from mx.DateTime import RelativeDateTime, now, DateTime, localtime
+from datetime import datetime
+from dateutil.relativedelta import relativedelta
 
 from osv import osv, fields
 import netsvc
@@ -538,14 +538,14 @@ class stock_planning(osv.osv):
         return res / product.uom_id.factor, uom.rounding
 
     def calculate_planning(self, cr, uid, ids, context, *args):
-        one_minute = RelativeDateTime(minutes=1)
-        current_date_beginning_c = mx.DateTime.today()
-        current_date_end_c = current_date_beginning_c  + RelativeDateTime(days=1, minutes=-1)  # to get hour 23:59:00
+        one_minute = relativedelta(minutes=1)
+        current_date_beginning_c = datetime.today()
+        current_date_end_c = current_date_beginning_c  + relativedelta(days=1, minutes=-1)  # to get hour 23:59:00
         current_date_beginning = current_date_beginning_c.strftime('%Y-%m-%d %H:%M:%S')
         current_date_end = current_date_end_c.strftime('%Y-%m-%d %H:%M:%S')
         for val in self.browse(cr, uid, ids, context=context):
-            day = mx.DateTime.strptime(val.period_id.date_start, '%Y-%m-%d %H:%M:%S')
-            dbefore = mx.DateTime.DateTime(day.year, day.month, day.day) - one_minute
+            day = datetime.strptime(val.period_id.date_start, '%Y-%m-%d %H:%M:%S')
+            dbefore = datetime(day.year, day.month, day.day) - one_minute
             day_before_calculated_period = dbefore.strftime('%Y-%m-%d %H:%M:%S')   # one day before start of calculated period
             cr.execute("SELECT date_start \
                     FROM stock_period AS period \
@@ -556,8 +556,9 @@ class stock_planning(osv.osv):
             date = cr.fetchone()
             start_date_current_period = date and date[0] or False
             start_date_current_period = start_date_current_period or current_date_beginning
-            day = mx.DateTime.strptime(start_date_current_period, '%Y-%m-%d %H:%M:%S')
-            dbefore = mx.DateTime.DateTime(day.year, day.month, day.day) - one_minute
+            
+            day = datetime.strptime(start_date_current_period, '%Y-%m-%d %H:%M:%S')
+            dbefore = datetime.datetime(day.year, day.month, day.day) - one_minute
             date_for_start = dbefore.strftime('%Y-%m-%d %H:%M:%S')   # one day before current period
             already_out = self._get_in_out(cr, uid, val, start_date_current_period, current_date_end, direction='out', done=True, context=context),
             already_in = self._get_in_out(cr, uid, val, start_date_current_period, current_date_end, direction='in', done=True, context=context),
diff --git a/addons/stock_planning/wizard/stock_planning_create_periods.py b/addons/stock_planning/wizard/stock_planning_create_periods.py
index 61e699c84f7..12e0d56e755 100644
--- a/addons/stock_planning/wizard/stock_planning_create_periods.py
+++ b/addons/stock_planning/wizard/stock_planning_create_periods.py
@@ -20,8 +20,8 @@
 ##############################################################################
 
 import time
-import mx.DateTime
-from mx.DateTime import RelativeDateTime, now, DateTime, localtime
+from datetime import datetime
+from dateutil.relativedelta import relativedelta 
 
 from osv import osv, fields
 
@@ -35,10 +35,10 @@ class stock_period_createlines(osv.osv_memory):
         result = cr.fetchone()
         last_date = result and result[0] or False
         if last_date:
-            period_start = mx.DateTime.strptime(last_date,"%Y-%m-%d %H:%M:%S")+ RelativeDateTime(days=1)
-            period_start = period_start - RelativeDateTime(hours=period_start.hour, minutes=period_start.minute, seconds=period_start.second)
+            period_start = datetime(last_date,"%Y-%m-%d %H:%M:%S")+ relativedelta(days=1)
+            period_start = period_start - relativedelta(hours=period_start.hour, minutes=period_start.minute, seconds=period_start.second)
         else:
-            period_start = mx.DateTime.today()
+            period_start = datetime.today()
         return period_start.strftime('%Y-%m-%d')
 
 
@@ -59,35 +59,35 @@ class stock_period_createlines(osv.osv_memory):
         lines = []
         for p in self.browse(cr, uid, ids, context=context):
             dt = p.date_start
-            ds = mx.DateTime.strptime(p.date_start, '%Y-%m-%d')
+            ds = datetime.strptime(p.date_start, '%Y-%m-%d')
             while ds.strftime('%Y-%m-%d') < p.date_stop:
                 if name =='Daily':
-                    de = ds + RelativeDateTime(days=interval, minutes =-1)
+                    de = ds + relativedelta(days=interval, minutes =-1)
                     new_name = de.strftime('%Y-%m-%d')
                     new_id = period_obj.create(cr, uid, {
                     'name': new_name,
                     'date_start': ds.strftime('%Y-%m-%d'),
                     'date_stop': de.strftime('%Y-%m-%d %H:%M:%S'),
                     })
-                    ds = ds + RelativeDateTime(days=interval) + 1
+                    ds = ds + relativedelta(days=interval) + 1
                 if name =="Weekly":
-                    de = ds + RelativeDateTime(days=interval, minutes =-1)
+                    de = ds + relativedelta(days=interval, minutes =-1)
                     new_name = de.strftime('%Y, week %W')
                     new_id = period_obj.create(cr, uid, {
                     'name': new_name,
                     'date_start': ds.strftime('%Y-%m-%d'),
                     'date_stop': de.strftime('%Y-%m-%d %H:%M:%S'),
                     })
-                    ds = ds + RelativeDateTime(days=interval) + 1
+                    ds = ds + relativedelta(days=interval) + 1
                 if name == "Monthly":
-                    de = ds + RelativeDateTime(months=interval, minutes=-1)
+                    de = ds + relativedelta(months=interval, minutes=-1)
                     new_name = ds.strftime('%Y/%m')
                     new_id =period_obj.create(cr, uid, {
                     'name': new_name,
                     'date_start': ds.strftime('%Y-%m-%d'),
                     'date_stop': de.strftime('%Y-%m-%d %H:%M:%S'),
                     })
-                    ds = ds + RelativeDateTime(months=interval)
+                    ds = ds + relativedelta(months=interval)
                 lines.append(new_id)
         return {
             'domain': "[('id','in', ["+','.join(map(str, lines))+"])]",
diff --git a/addons/survey/survey.py b/addons/survey/survey.py
index 61d96f792f8..57a78e9ac5d 100644
--- a/addons/survey/survey.py
+++ b/addons/survey/survey.py
@@ -27,9 +27,9 @@ import netsvc
 from tools.translate import _
 
 from time import strftime
-import datetime
+from datetime import datetime
+from dateutil.relativedelta import relativedelta
 import copy
-from mx.DateTime import *
 import os
 
 class survey_type(osv.osv):
@@ -694,7 +694,7 @@ class survey_request(osv.osv):
     }
     _defaults = {
         'state': lambda * a: 'draft',
-#        'date_deadline': lambda * a :  (now() + RelativeDateTime(months=+1)).strftime("%Y-%m-%d %H:%M:%S")
+#        'date_deadline': lambda * a :  (datetime.now() + relativedelta(months=+1)).strftime("%Y-%m-%d %H:%M:%S")
     }
     def survey_req_waiting_answer(self, cr, uid, ids, arg):
         self.write(cr, uid, ids, { 'state' : 'waiting_answer'})