获得指定日期的前n天获取一段时间的每一天日期

曾经终败给现在 2024-02-05 22:46 12阅读 0赞

/**
    
         * 获得指定日期的前n天
    
         *
    
         * @param specifiedDay yy-MM-dd
    
         * @return
    
         * @throws Exception
    
         */
    
        public static String getBeforeDay(String specifiedDay,Integer days) {
            Calendar c = Calendar.getInstance();
            Date date = null;
            try {
                date = new SimpleDateFormat("yyyy-MM-dd").parse(specifiedDay);
            }
            catch (ParseException e) {
                e.printStackTrace();
            }
            c.setTime(date);
            int day = c.get(Calendar.DATE);
            c.set(Calendar.DATE, day - days);
            String dayBefore = new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
            return dayBefore;
        }
    
        public static String parseYyyyMMdd(Date date) {
            SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
            String dateString = formatter.format(date);
            return dateString;
        }
    
        /**
         * 获取一段时间的每一天日期
         */
        public static List<String> getBetweenDate(String start, String end) {
            List<String> list = new ArrayList<>();
            LocalDate startDate = LocalDate.parse(start);
            LocalDate endDate = LocalDate.parse(end);
            long distance = ChronoUnit.DAYS.between(startDate, endDate);
            if (distance < 1) {
                return list;
            }
            Stream.iterate(startDate, d -> d.plusDays(1)).limit(distance + 1).forEach(f -> list.add(f.toString()));
            return list;
        }
    
        public static void main(String[] args) {
            Date today = new Date();
            String endDayToday = parseYyyyMMdd(today);
            String startDay = getBeforeDay(endDayToday, 6);
            List<String> betweenDate = getBetweenDate(startDay, endDayToday);
    
    
            List<String> betweenDate2 = getBetweenDate("2024-01-01", "2024-05-06");
    
    
            System.out.println();
        }