how to format a string value containing date to yyyy-mm-dd?

Question

我有一个字符串变量，显示日期值为ddmmyyyy（04112013）。我想将此字符串值格式化为yyyy.mm.dd（2013.11.04）。这是在java中执行此操作的最佳方法吗？

Answer 1

You can use SimpleDateFormat#parse() to parse a String in a certain pattern into a Date.

String oldstring = "04112013";
Date date = new SimpleDateFormat("ddMMyyyy").parse(oldstring);

Use SimpleDateFormat#format() to format a Date into a String in a certain pattern.

String newstring = new SimpleDateFormat("yyyy.MM.dd").format(date);
System.out.println(newstring);

I hope it helps.