How to convert a date from format MM/dd/yyyy to Julian format CCYYDDD?

Question

I have the following function "Format" to convert a date from the format "MM/dd/yyyy" to MMddyyyy. This function works with the below data but would not work if I want to convert a date from "MM/dd/yyyy" to CCYYDDD. What should be done in this function to support Julian date conversion? Thanks for any help!

string Value = "03/11/2011";
string formatType = "System.DateTime";
string outputformat = "MMddyyyy";

Value = Format(formatType, Value, outputformat);

private static string Format(string typename, string value, string format)
    {
        Type t = Type.GetType(typename);

        System.Reflection.MethodInfo infoParse = t.GetMethod("Parse", new Type[] { typeof(string) });
        object o = infoParse.Invoke(null, new object[] { value });

        System.Reflection.MethodInfo infoToString = t.GetMethod("ToString", new Type[] { typeof(string) });

        return infoToString.Invoke(o, new object[] { format }) as string;
    }

Answer 1

使用输出格式“ yyyyddd”。