computes first *exclusive* timeperiod for job to process

def compute_end_timeperiod(self, process_name, timeperiod):
        """ computes first *exclusive* timeperiod for job to process """
        time_qualifier = context.process_context[process_name].time_qualifier
        end_timeperiod = time_helper.increment_timeperiod(time_qualifier, timeperiod)
        return end_timeperiod