def METHOD_NAME(topology_st, log_dir):
    '''
    Execute logconv.pl with -S and -E(endtime) with invalid time stamp
    This is a negative test case, where it should give error message
    '''
    #
    # Execute logconv.pl -S and -E with invalid timestamp
    #
    log.info('Running test_ticket47910 - Execute logconv.pl -S -E with invalid timestamp')
    log.info("Set start time and end time to invalid values")
    start_time_stamp = "invalid"
    end_time_stamp = "invalid"
    log.info("Executing logconv.pl with -S and -E")
    result = execute_logconv(topology_st.standalone, start_time_stamp, end_time_stamp, log_dir)
    assert result == 1