java - String("2013-4-25") to date conversion

Question

I have a String like "2013-4-25" I need to convert this into "MM-dd-yyyy" format. Later I will have to append this date like

Calendar cal=new GregorianCalendar();
cal.setTime(date);
cal.set(Calendar.HOUR, 23);
cal.set(Calendar.MINUTE, 59);
cal.set(Calendar.SECOND, 59);

How could I do this?

Answer 1

使用SimpleDateFormat：

        Date date = new Date();
        Calendar cal=new GregorianCalendar();
        cal.setTime(date);
        cal.set(Calendar.HOUR, 23);
        cal.set(Calendar.MINUTE, 59);
        cal.set(Calendar.SECOND, 59);

        SimpleDateFormat sdf = new SimpleDateFormat("MM-dd-yyyy");
        System.out.println(sdf.format(cal.getTime()));

Answer 2

用这个

String str = "2013-4-25";
        SimpleDateFormat formatter = new SimpleDateFormat("MM-dd-yyyy");
        try {
            SimpleDateFormat parseFormatter = new SimpleDateFormat("yyyy-MM-dd");

            Date date = parseFormatter.parse(str);

            String formattedDate = formatter.format(date);
            System.out.println(formattedDate);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

Answer 3

使用JodaTime和DateMidnight类，您不必自己规范日期。像这样的东西：

DateTimeFormatter format = DateTimeFormatter.fromPattern("yyyy-MM-dd");
DateMidnight date = DateMidnight.parse(date, format);

JDK 中的Calendar和DateAPI 很痛苦……

Answer 4

您可以使用SimpleDateFormat. 检查此链接：http ://www.java2s.com/Tutorial/Java/0040__Data-Type/SimpleDateFormat.htm

您可以指定您选择的格式化程序，然后相应地格式化日期。