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前言

现在是2022年4月16日15:35:14！忙里偷闲，直接来看方法吧，写完文章继续去改Bug:

1.计算两个日期之间相差的天数

/*** @param stratTime 开始时间* @param endTime 结束时间* @return 计算两个日期之间相差的天数*/public static Map<String, Object> dateDiff(Long stratTime, Long endTime) {Map<String, Object> map = new HashMap<>();Long diff = endTime - stratTime;Long day = diff / (24 * 60 * 60 * 1000);Long hour = (diff / (60 * 60 * 1000) - day * 24);Long min = ((diff / (60 * 1000)) - day * 24 * 60 - hour * 60);Long sec = (diff / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);map.put("day", day);map.put("hour", hour);map.put("min", min);map.put("sec", sec);return map;}

2.将时间戳转换成时间

	/*** 将时间戳转换成时间*/public static Map<String, Object> formatTime(Long time) {Map<String, Object> map = new HashMap<>();Long day = time / (24 * 60 * 60 * 1000);Long hour = (time / (60 * 60 * 1000) - day * 24);Long min = ((time / (60 * 1000)) - day * 24 * 60 - hour * 60);Long sec = (time / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);map.put("day", day);map.put("hour", hour);map.put("min", min);map.put("sec", sec);return map;}

3. 获取当前24小时的时间前后时间戳

	/*** 将时间戳转换成时间*/public static Map<String, Object> getTimeChuo() {Map<String, Object> map = new HashMap<>();Long nowTime = System.currentTimeMillis();Long startTime = nowTime - 24 * 60 * 60 * 1000;Long endTime = nowTime + 24 * 60 * 60 * 1000;map.put("startTime", startTime);map.put("endTime", endTime);return map;}

4.由出生日期获得年龄

	public static int getAge(Date birthDay) throws Exception {Calendar cal = Calendar.getInstance();if (cal.before(birthDay)) {throw new IllegalArgumentException("出生日期小于当前时间，无效的日期!");}int yearNow = cal.get(Calendar.YEAR);int monthNow = cal.get(Calendar.MONTH);int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH);cal.setTime(birthDay);int yearBirth = cal.get(Calendar.YEAR);int monthBirth = cal.get(Calendar.MONTH);int dayOfMonthBirth = cal.get(Calendar.DAY_OF_MONTH);int age = yearNow - yearBirth;if (monthNow <= monthBirth) {if (monthNow == monthBirth) {if (dayOfMonthNow < dayOfMonthBirth) age--;} else {age--;}}return age;}

5.统计两个日期之间的所有日期

		/*** 统计两个日期之间的所有日期*/public static List<String> getBeginTimeAndEndTime(Date beginTime, Date endTime) {List<String> listDate = new ArrayList<>();SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");try {Calendar calendar = Calendar.getInstance();calendar.setTime(beginTime);while (calendar.getTime().before(endTime) || calendar.getTime().equals(endTime)) {listDate.add(dateFormat.format(calendar.getTime()));calendar.add(Calendar.DAY_OF_MONTH, 1);}return listDate;} catch (Exception e) {e.printStackTrace();}return listDate;}

6.根据生日获取年龄的另一种方法

	/*** 根据日期获取年龄*/public static int getAgeByDate(Date date) throws Exception {Calendar cal = Calendar.getInstance();int thisYear = cal.get(Calendar.YEAR);int thisMonth = cal.get(Calendar.MONTH);int dayOfMonth = cal.get(Calendar.DAY_OF_MONTH);cal.setTime(date);int birthYear = cal.get(Calendar.YEAR);int birthMonth = cal.get(Calendar.MONTH);int birthdayOfMonth = cal.get(Calendar.DAY_OF_MONTH);int age = thisYear - birthYear;// 未足月if (thisMonth <= birthMonth) {// 当月if (thisMonth == birthMonth) {// 未足日if (dayOfMonth < birthdayOfMonth) {age--;}} else {age--;}}return age;}