int main()  {    string bank_y,bank_m,bank_d,bank_da1,bank_da2,bank_mm;    bank_da1=get_cur_date_std();  bank_da2=date_to_acc_cap(bank_da1);  msg("标准日期  "+bank_da1,bank_da2);  msg("财务日期  "+bank_da2);    bank_y = year_to_acc_cap(date_pick_year(bank_da1));  bank_m= month_to_acc_cap(date_pick_month(bank_da1));  bank_d= day_to_acc_cap(date_pick_day(bank_da1));  msg("财务年  "+bank_y);  msg("财务月  "+bank_m);  msg("财务日  "+bank_d);  };    财务日期的月,和财务月都少了零,哪儿的问题呢?请给与指导