java.util.IllegalFormatConversionException：A！= java.lang.String为什么我可以打印日期

Question

我正在尝试打印日期，但它不能以我需要的格式工作

 import java.util.Scanner;
    import java.util.Calendar;

    public class MartinezC001PA2
    {
      public static void main(String[] args)
      {
        Scanner in = new Scanner(System.in);//for user input
        Calendar dateTime = Calendar.getInstance();//to get date and time

        String userName = "";
        String stockStatus = String.format("\n\nSTOCK PURCHASES FOR %S \nAS OF %1$TA, %1$TB %1$Td, %1$TY", userName, dateTime);

        System.out.print(stockStatus);
      }//END MAIN

    }

Answer 1

DateFormat dateFormat = new SimpleDateFormat（“yyyy / MM / dd HH：mm：ss”）;

日历cal = Calendar.getInstance（）;

的System.out.println（dateFormat.format（cal.getTime（）））;