string convert to DateTime C# 兩種做法

string xx= Model.xx;
DateTime dt = Convert.ToDateTime(xx);
     
string format = "yyyy/MM/dd";
(<%=dt.ToString(format)%>)

FundSizeDate = string.Format("{0}/{1}/{2}", dt.Year, dt.Month, dt.Day);
(<%=String.Format("{0:yyyy/MM/dd}", xx)%>