java - 定义日期格式 java 'rd' 'st' 'th' 'nd'

Question

我有一个字符串 "Saturday, Oct, 25th, 11:40"

这个日期有什么格式？我如何解析 ordinal indicator ？

下面是我想要转换它的方式

private String changeDateFormat(String stringDate){

        DateFormat dateFormat = new SimpleDateFormat("DD, MM, ddth, hh:mm");
        try {
            Date date = dateFormat.parse(stringDate);
            dateFormat = new SimpleDateFormat("ddMMMyyyy");
            stringDate=dateFormat.format(date);
        } catch (ParseException e) {
            e.printStackTrace();
        }

        return stringDate.toUpperCase();
    }

Answer 1

希望这个程序能解决您的问题。

public class Test
{
  public static void main(String[] args)  {
    System.out.println(new Test().getCurrentDateInSpecificFormat(Calendar.getInstance()));
  }

  private String getCurrentDateInSpecificFormat(Calendar currentCalDate) {
    String dayNumberSuffix = getDayNumberSuffix(currentCalDate.get(Calendar.DAY_OF_MONTH));
    DateFormat dateFormat = new SimpleDateFormat("E, MMM, dd'"+ dayNumberSuffix +"', HH:mm");
    return dateFormat.format(currentCalDate.getTime());
  }

  private String getDayNumberSuffix(int day) {
    if (day >= 11 && day <= 13) {
      return "th";
    }
    switch (day % 10) {
    case 1:
      return "st";
    case 2:
      return "nd";
    case 3:
      return "rd";
    default:
      return "th";
    }
  }

}