计算两个日期相差天数

public long date2Date(String sdate1, String sdate2) {
   SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
   try {
    Date date1 = sdf.parse(sdate1);
    Date date2 = sdf.parse(sdate2);
    return date2.getTime() / (24 * 60 * 60 * 1000) - date1.getTime()/ (24 * 60 * 60 * 1000);
   } catch (ParseException e) {
    e.printStackTrace();
    return 0;
   }  
  } public static void main(String[] args) {
   DateTest dt = new DateTest();
   long date = dt.date2Date("2012-4-11", "2012-4-23");
   System.out.println("相差：" + date); }