code: public static String getNextDay2String(String nowdate, String delay, Format format) {
          try {
              SimpleDateFormat localFormat = (SimpleDateFormat) format;
              String mdate = "";
              Date date = strToDateWithFormat(nowdate, localFormat);
              long myTime = (date.getTime() / 1000) + Integer.parseInt(delay) * 24 * 60 * 60;
              date.setTime(myTime * 1000);
              mdate = localFormat.format(date);
              return mdate;
          } catch (Exception e) {
              return "";
          }
      }
docs: 将当前时间前移或后移若干天之后的日期(前移则将delay赋负值)
  
  @param nowdate
  @param delay
  @param format
  
  @return
  
  @author kanghongwei