Method day

src/main/java/com/opslab/helper/DateHelper.java:203–208

在当前时间的基础上加或减去几天 @param day @return

(int day)

     * @return
     */
    public static Date day(int day) {
        Calendar Cal = Calendar.getInstance();
        Cal.setTime(new Date());
        Cal.add(Calendar.DAY_OF_YEAR, day);
        return Cal.getTime();
    }

    /**
     * 在指定的时间上加或减去几天