获取时间范围内的每天的日期，格式“yyyyMMdd”

最新推荐文章于 2024-02-04 09:19:30 发布

原创最新推荐文章于 2024-02-04 09:19:30 发布 · 2.1k 阅读

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#日期 #时间

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本文介绍了一个实用的方法，用于生成两个指定日期之间的所有日期列表。通过使用Java的Calendar和SimpleDateFormat类，该方法能够准确地计算出起始日期到结束日期间每一天的日期，并将它们以字符串形式返回。

Test 方法测试

@Test
	public void dateList() throws IOException, ParseException {
		String beginDay = "20191101";
		String endDay = "20191209";
		List<String> dateList = new ArrayList<>();
		SimpleDateFormat sdf1 = new SimpleDateFormat("yyyyMMdd");
		Date beginDate = sdf1.parse(beginDay);
		Date endDate = sdf1.parse(endDay);
		Calendar beginCalendar = Calendar.getInstance();
		Calendar endCalendar = Calendar.getInstance();
		beginCalendar.setTime(beginDate);
		endCalendar.setTime(endDate);
		int maxDate = 0;
			if (endCalendar.get(Calendar.YEAR) == beginCalendar.get(Calendar.YEAR)) {
				maxDate = endCalendar.get(Calendar.DAY_OF_YEAR) - beginCalendar.get(Calendar.DAY_OF_YEAR);
			} else if (endCalendar.get(Calendar.YEAR) > beginCalendar.get(Calendar.YEAR)) {
				int endNumber = endCalendar.get(Calendar.DAY_OF_YEAR);
				int beginNumber = DateUtils.getYearDays(Integer.valueOf(beginDay.substring(0, 4)))
						- beginCalendar.get(Calendar.DAY_OF_YEAR);
				maxDate = endNumber + beginNumber;
			}
		for (int i = 0; i <= maxDate; i++) {
			dateList.add(sdf1.format(beginCalendar.getTime()));
			beginCalendar.add(Calendar.DATE, 1);
		}
		for (String strDate : dateList) {
			System.out.println(strDate);
		}
	}

测试结果展示

封装好的方法

/**
	 * 获取日期范围内每天的日期
	 * @param beginDay 格式“yyyyMMdd”
	 * @param endDay 格式“yyyyMMdd”
	 * @return
	 */
	public List<String> getStrDateList(String beginDay,String endDay){
		List<String> dateList = new ArrayList<>();
		SimpleDateFormat sdf1 = new SimpleDateFormat("yyyyMMdd");
		Date beginDate;
		try {
			beginDate = sdf1.parse(beginDay);
			Date endDate = sdf1.parse(endDay);
			Calendar beginCalendar = Calendar.getInstance();
			Calendar endCalendar = Calendar.getInstance();
			beginCalendar.setTime(beginDate);
			endCalendar.setTime(endDate);
            int maxDate = 0;
			if (endCalendar.get(Calendar.YEAR) == beginCalendar.get(Calendar.YEAR)) {
				maxDate = endCalendar.get(Calendar.DAY_OF_YEAR) - beginCalendar.get(Calendar.DAY_OF_YEAR);
			} else if (endCalendar.get(Calendar.YEAR) > beginCalendar.get(Calendar.YEAR)) {
				int endNumber = endCalendar.get(Calendar.DAY_OF_YEAR);
				int beginNumber = DateUtils.getYearDays(Integer.valueOf(beginDay.substring(0, 4)))
						- beginCalendar.get(Calendar.DAY_OF_YEAR);
				maxDate = endNumber + beginNumber;
			}
			for (int i = 0; i <= maxDate; i++) {
				dateList.add(sdf1.format(beginCalendar.getTime()));
				beginCalendar.add(Calendar.DATE, 1);
			}
		} catch (ParseException e) {
			
			e.printStackTrace();
		}	
		return dateList;		
	}

获取时间范围之间的天数

/**
	 * @param date1
	 * @param date2
	 * @return
	 * @throws ParseException
	 */
	public static int betweenDays(String beginDay, String endDay) throws ParseException {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
		Date date1 = sdf.parse(beginDay);
		Date date2 = sdf.parse(endDay);
		System.out.println(date1);
		Calendar begin = DateUtil.toCalendar(date1);
		Calendar end =  DateUtil.toCalendar(date2);		
		long msBegin = begin.getTimeInMillis();
		long msEnd = end.getTimeInMillis();
		long between_days = (msEnd - msBegin) / (1000 * 3600 * 24);
		between_days = Math.abs(between_days);
		return Integer.parseInt(String.valueOf(between_days));
	}