DateUtil工具类记录

为支持日常工作需要，记录所用到的一些关于时间的工具类方法。随时进行补充。

/*** Description:获取两个日期之间的天数差* @Author:hanyq* @Date:2023/9/19 11:23*/public static int getDateDifference(Date startDate,Date endDate){int days = 0;try {Calendar startCalendar = Calendar.getInstance();startCalendar.setTime(startDate);Calendar endCalendar = Calendar.getInstance();endCalendar.setTime(endDate);//计算两个日期相差的天数//startCalendar.getTime().getTime()返回long毫秒数形式,毫秒转为秒所以除以1000//1天=24小时，1小时=60分，1分=60秒，所以两个时间的差再除以60 * 60 * 24换算成天的形式days = ((int) (startCalendar.getTime().getTime() / 1000) - (int) (endCalendar.getTime().getTime() / 1000)) / (60 * 60 * 24);} catch (Exception e) {e.printStackTrace();}return days;}/*** 比较两个时间大小(当时间A大于等于时间B时会返回false;反之时间A小于时间B时会返回true)* @param startDate 时间A* @param endDate   时间B* @return*/public static Boolean compareDate(Date startDate,Date endDate){Boolean result = false;SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");try {result = startDate.after(endDate);} catch (Exception e) {e.printStackTrace();}return result;}/*** 获取当前日期对应的一周的开始日期* @param date* @return*/public static Calendar getFirstDayOfWeek(Date date){Calendar result = null;try{Calendar calendarIndex = Calendar.getInstance();calendarIndex.setTime(date);//先判断该日期是否是周日，如果是的话将其减一(西方周六为一周结束，而我们以周日为一周结束)LocalDate weekHandle = LocalDate.of(calendarIndex.get(Calendar.YEAR), calendarIndex.get(Calendar.MONTH) + 1, calendarIndex.get(Calendar.DATE));int week = weekHandle.getDayOfWeek().getValue();Calendar calendar = Calendar.getInstance();calendar.setTime(date);if (week == 7){calendar.add(Calendar.DAY_OF_MONTH, -1);}calendar.set(Calendar.DAY_OF_WEEK, calendar.getActualMinimum(Calendar.DAY_OF_WEEK));calendar.add(Calendar.DAY_OF_MONTH, 1);result = calendar;}catch (Exception e){e.printStackTrace();}finally {return result;}}/*** 获取当前日期对应的一周的结束日期* @param date* @return*/public static Calendar getLastDayOfWeek(Date date){Calendar result = null;try{Calendar calendarIndex = Calendar.getInstance();calendarIndex.setTime(date);//先判断该日期是否是周日，如果是的话将其减一(西方周六为一周结束，而我们以周日为一周结束)LocalDate weekHandle = LocalDate.of(calendarIndex.get(Calendar.YEAR), calendarIndex.get(Calendar.MONTH) + 1, calendarIndex.get(Calendar.DATE));int week = weekHandle.getDayOfWeek().getValue();Calendar calendar = Calendar.getInstance();calendar.setTime(date);if (week == 7){calendar.add(Calendar.DAY_OF_MONTH, -1);}calendar.set(Calendar.DAY_OF_WEEK, calendar.getActualMaximum(Calendar.DAY_OF_WEEK));calendar.add(Calendar.DAY_OF_MONTH, 1);result = calendar;}catch (Exception e){e.printStackTrace();}finally {return result;}}/*** Description:获取当时间所属月份开始时间* @Author:hanyq* @Date:2023/10/17 17:39*/public static Calendar getFirstDayOfMonth(Date date) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);calendar.set(Calendar.DAY_OF_MONTH, 1);return calendar;}/*** Description:获取当时间所属月份结束时间* @Author:hanyq* @Date:2023/10/17 17:39*/public static Calendar getLastDayOfMonth(Date date) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));return calendar;}/*** Description:获取当时间所属年份开始时间* @Author:hanyq* @Date:2023/10/17 17:50*/public static Calendar getFirstDayOfYear(Date date) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);calendar.set(Calendar.DAY_OF_YEAR, 1);return calendar;}/*** Description:获取当时间所属年份结束时间* @Author:hanyq* @Date:2023/10/17 17:50*/public static Calendar getLastDayOfYear(Date date) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);calendar.set(Calendar.DAY_OF_YEAR, calendar.getActualMaximum(Calendar.DAY_OF_YEAR));return calendar;}