中文字符串日期改成英文的日期格式

<%@ page import="java.text.DateFormat"%>
<%@ page import="java.text.SimpleDateFormat"%>
<%@ page import="java.util.Date"%>
<%@ page import="java.util.Locale"%>
String registedday = "17-03-2017";
registedday = registedday.split("-")[2] + registedday.split("-")[0]
+ registedday.split("-")[1];
Locale l = new Locale("en");
DateFormat sdf = new SimpleDateFormat("yyyyMMdd");
Date date = sdf.parse(registedday);
String day = String.format("%td", date);
String month = String.format(l, "%tb", date);
String year = String.format("%ty", date);
registedday = day + " " + month + " " + year;