日期的计算

//取当前时间n天后的日期(YYYY-MM-DD)
    protected String nextMonthDateToStrHHMISS(int d){
   
String sd = "";
try {

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date());
calendar.add(Calendar.DAY_OF_MONTH, d);

long lnum = calendar.getTimeInMillis();
Date newdd = new Date(lnum);
sd = sdf.format(newdd);
} catch (Exception e) {
e.printStackTrace();
}
return sd;
}