Improve precision in time calculation

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@13985 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/CalendarPeriod.py

@@ -143,9 +143,9 @@ class CalendarPeriod(Movement, PeriodicityMixin):
       stop_date = self.getStopDate(start_date)
       periodicity_stop_date = self.getPeriodicityStopDate(
                                           start_date)
-      duration = stop_date - start_date
+      second_duration = int(stop_date) - int(start_date)
       # First date has to respect the periodicity config
-      next_start_date = self.getNextPeriodicalDate(start_date-1)
+      next_start_date = self.getNextPeriodicalDate(addToDate(start_date, day=-1))
       while (next_start_date is not None) and \
         (next_start_date <= periodicity_stop_date):
 
@@ -163,7 +163,8 @@ class CalendarPeriod(Movement, PeriodicityMixin):
            (current_exception_date < next_start_date.Date()):
           # SQL method don't like iterator
 #             yield (next_start_date, next_start_date+duration)
-          result.append([next_start_date, next_start_date+duration])
+          result.append([next_start_date, addToDate(next_start_date, 
+                                                    second=second_duration)])
           # Update the next exception date
           if len(exception_date_list) != 0:
             current_exception_date = exception_date_list.pop(0).Date()
@@ -172,7 +173,8 @@ class CalendarPeriod(Movement, PeriodicityMixin):
         else:
           # SQL method don't like iterator
 #             yield (next_start_date, next_start_date+duration)
-          result.append([next_start_date, next_start_date+duration])
+          result.append([next_start_date, addToDate(next_start_date,
+                                                    second=second_duration)])
         next_start_date = self.getNextPeriodicalDate(next_start_date)
 
     return result