java获取前N天日期

//获取时间的方法 public static Date getBeforeOrAfterDate(Date date, int num) { Calendar calendar = Calendar.getInstance();//获取日历 calendar.setTime(date);//当date的值是当前时间，则可以不用写这段代码。 calendar.add(Calendar.DATE, num); Date d = calendar.getTime();//把日历转换为Date return d; }

 

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");//格式转换 String beginTime = sdf.format(getBeforeOrAfterDate(new Date(), -6)) + " 00:00:00"; String endTime = sdf.format(new Date()) + " 23:59:59"; List<String> dayBetween = new ArrayList<>();//组装7天的日期集合 for (int i = 6; i >= 0; i--) { dayBetween.add(sdf.format(getBeforeOrAfterDate(new Date(), -i))); }