allow the definition of shift in weekends

dream/plugins/JobShop/ReadJSShifts.py

@@ -188,6 +188,13 @@ class ReadJSShifts(plugin.InputPreparationPlugin, TimeSupportMixin):
               # calculate the number of days till the end of the exception
               else:
                 exceptionDay = math.floor((exception[-1] - hoursToEndFirstDay.total_seconds()/3600)/24) + 1
+              # check the weekday 
+              exceptionDate=now+datetime.timedelta(days=exceptionDay)
+              # if it is weekend create shift entry for that date. The default pattern does not need to be changed
+              if exceptionDate.weekday() in [5,6]:
+                  defaultShiftPattern[node].append(exception)
+              # for exceptions in weekdays
+              else:                
                   for index2, default in enumerate(defaultShiftPattern[node]):
                     # check if we still are in the first day
                     if hoursToEndFirstDay.total_seconds()/3600 > default[-1]: