:param dt:  pythone datetime.datetime
    :return:  1999-02-01 09:30:91 string type

def QA_util_datetime_to_strdatetime(dt):
    """
    :param dt:  pythone datetime.datetime
    :return:  1999-02-01 09:30:91 string type
    """
    strdatetime = "%04d-%02d-%02d %02d:%02d:%02d" % (
        dt.year,
        dt.month,
        dt.day,
        dt.hour,
        dt.minute,
        dt.second
    )
    return strdatetime