获取当前实际的后5天 跨月_java 获取每个月的倒数第5天

/**
     * @param date string 转日期
     * @return
     */
    public static Date transBackDate(String date) {
        Date parse = new Date();
        try {
            if (date=="" || date.equals("0") || date.equals(null) || date.equals("null")){
                return  format.parse("19700101");
            }
            Date  date1 =  format.parse(date);


            long time = date1.getTime();
            long newTime = time + 5 * 24 * 60 * 60 * 1000;

            Calendar calendar = Calendar.getInstance();
            calendar.setTimeInMillis(newTime);
            Integer year = calendar.get(Calendar.YEAR);
            Integer month = calendar.get(Calendar.MONTH) + 1;
            String monthString = "";
            String dayString = "";
            if (month < 10) {
                monthString = "0" + month.toString();
            } else {
                monthString = month.toString();
            }

            Integer day = (calendar.get(Calendar.DATE));
            if (day < 10) {
                dayString = "0" + day.toString();
            } else {
                dayString = day.toString();
            }
            StringBuilder sbVar1 = new StringBuilder();
            String date2 = sbVar1.append(year).append(monthString).append(dayString).toString();
            parse =  format.parse(date2);

        } catch (ParseException e) {
            e.printStackTrace();
        }
        return parse;
    }
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