.net中Oracle日期类型的处理

public string rqcl(string rqz)

{

CultureInfo ci = new CultureInfo("de-DE");

string sz = System.Convert .ToDateTime(rqz).ToShortDateString();

DateTime dt = System.Convert .ToDateTime (sz);

string rq =dt.ToString("d",ci).Insert(5,"月 ");

if(dt.Month>9)

{

}

else

{

rq=rq.Substring(0,3)+rq.Substring(4,rq.Length-4);

}

return(rq);

}