java8新特性 LocalDateTime，LocalDate ，LocalTime 使用，Period 獲取時間差

LocalDateTime使用
DateTimeFormatter dateTimeFormatter=DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
//獲取當前時間
LocalDateTime date=LocalDateTime.now();
System.out.println("YEAR"+date.getYear());
System.out.println("MONTH"+date.getMonth());
System.out.println("DAY"+date.getDayOfMonth());
System.out.println("HOUR"+date.getHour());
System.out.println("MINUTES"+date.getMinute());
System.out.println("SECOND"+date.getSecond());

System.out.println("localDateTime"+dateTimeFormatter.format(date));
//當前年的第一天
LocalDateTime firstdayOfYear =date.with(TemporalAdjusters.firstDayOfNextYear());
System.out.println("firstdayOfYear"+dateTimeFormatter.format(firstdayOfYear));
//當前年的最后一天
LocalDateTime enddayOfYear =date.with(TemporalAdjusters.lastDayOfYear());
System.out.println("enddayOfYear"+dateTimeFormatter.format(enddayOfYear));
//獲取當前月的第一天
LocalDateTime firstdayOfMonth =date.with(TemporalAdjusters.firstDayOfMonth());
System.out.println("firstdayOfMonth"+dateTimeFormatter.format(firstdayOfMonth));
//獲取當前月的最后一天
LocalDateTime endDayOfMonth=date.with(TemporalAdjusters.lastDayOfMonth());
System.out.println("endDayOfMonth"+dateTimeFormatter.format(endDayOfMonth));
//獲取下個月第一天
LocalDateTime firstdayOfNextMonth=date.with(TemporalAdjusters.firstDayOfNextMonth());
System.out.println("firstdayOfNextMonth"+dateTimeFormatter.format(firstdayOfNextMonth));
//月增加一個月
LocalDateTime addMonth=date.plusMonths(1);
System.out.println("addMonth"+dateTimeFormatter.format(addMonth));
//月減少一個月
LocalDateTime lessenMonth=date.minusMonths(1);
System.out.println("lessenMonth"+dateTimeFormatter.format(lessenMonth));
//天增加一天
LocalDateTime addOfDay=date.plusDays(1);
System.out.println("addOfDay"+dateTimeFormatter.format(addOfDay));
//天減少一天
LocalDateTime lessOfDay=date.minusDays(1);
System.out.println("lessOfDay"+dateTimeFormatter.format(lessOfDay));

TemporalAdjusters方法

TemporalAdjusters.dayOfWeekInMonth() //同一個月中每一周的第幾天

TemporalAdjusters.firstDayOfMonth() //當月的第一天
TemporalAdjusters.firstDayOfNextMonth() //下月的第一天
TemporalAdjusters.firstDayOfYear() //當年的第一天
TemporalAdjusters.firstDayOfNextYear() //明年的第一天
TemporalAdjusters.firstInMonth() //同一個月中，第一個符合星期幾要求的值
TemporalAdjusters.lastDayOfMonth() //當月的最后一天
TemporalAdjusters.lastDayOfYear() // 當年的最后一天
TemporalAdjusters.lastInMonth() //同一個月中，最后一個符合星期幾要求的值
TemporalAdjusters.next() //第一個符合指定星期幾要求的值
TemporalAdjusters.previousOrSame()/nextOrSame() 

LocalDate 獲取當前時間

LocalDate localDate=LocalDate.now();
System.out.println("localDate"+localDate);
System.out.println("getYear"+localDate.getYear());
System.out.println("getMonth"+localDate.getMonth());
System.out.println("getDayOfMonth"+localDate.getDayOfMonth());

LocalTime 獲取當前時間

LocalTime localTime=LocalTime.now();

System.out.println("localTime"+localTime);

Period 獲取時間差

Period period=Period.between(LocalDate.of(2014,2,5),LocalDate.of(2014,2,5));

System.out.println("period"+period);