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获取当前日期

//当前日期和时间LocalDateTime nowDateTime=LocalDateTime.now();//当前日期LocalDate nowDate=LocalDate.now();//当前时间LocalTime nowTime=LocalTime.now();

获取起始和结束时间

//当前日期LocalDate now=LocalDate.now();//起始时间,LocalTime.MIN为00:00LocalDateTime startTime=LocalDateTime.of(now,LocalTime.MIN);//结束时间,LocalTime.MAX为23:59:59.999999999LocalDateTime endTime=LocalDateTime.of(now,LocalTime.MAX);

获取指定日期和时间

//当前日期LocalDate now=LocalDate.now();//一天的开始时间LocalDateTime startOfDay=now.atStartOfDay();//本周一LocalDate monday=now.with(DayOfWeek.MONDAY);//上周一LocalDate lastMonday=now.minusWeeks(1).with(DayOfWeek.MONDAY);//本月第一天LocalDate firstDayOfMonth=now.with(TemporalAdjusters.firstDayOfMonth());//本月最后一天LocalDate lastDayOfMonth=now.with(TemporalAdjusters.lastDayOfMonth());//感恩节(即11月第4个星期四)//withMonth()方法设置月份，需要注意这个月份是从1开始的，和Date以及Calendar的从0开始不同LocalDate thanksGivingDay=LocalDate.now().withMonth(11).withDayOfMonth(1).with(DayOfWeek.THURSDAY).plusWeeks(3L);;

计算时间差

//当前日期LocalDate now=LocalDate.now();//结束日期LocalDate endDate=now.plusWeeks(1L);//日期差值Period dateDiff=Period.between(now,endDate);//相差天数int dayDiffOfDate=dateDiff.getDays();//起始时间,LocalTime.MIN为00:00LocalDateTime startTime=LocalDateTime.of(now,LocalTime.MIN);//结束时间,LocalTime.MAX为23:59:59.999999999LocalDateTime endTime=LocalDateTime.of(now,LocalTime.MAX);//日期时间差值Duration timeDiff=Duration.between(startTime,endTime);//相差小时数,忽略分钟和秒long hourDiffOfTime=timeDiff.toHours();//相差分钟数,忽略秒long minutesDiffOfTime=timeDiff.toMinutes();//相差秒数long secondsDiffOfTime=timeDiff.getSeconds();

时区

//初始化日本时区,UTC+9ZoneId japanZone=ZoneOffset.ofHours(9);//日本现在时间ZonedDateTime japanNow=ZonedDateTime.now(japanZone);

日期格式化

//当前日期和时间LocalDateTime nowDateTime=LocalDateTime.now();//日期格式化DateTimeFormatter formatter=DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");//日期格式化字符串String dateStr=formatter.format(nowDateTime);//日期格式化字符串转为日期时间对象LocalDateTime localDateTime=LocalDateTime.parse(dateStr,formatter);

日期判断和比较

//当前日期LocalDate now=LocalDate.now();//结束日期LocalDate endDate=now.plusWeeks(1L);//日期是否相等now.isEqual(LocalDate.now());//是否在某个日期之前now.isBefore(endDate);//是否在某个日期之后now.isAfter(endDate);//年份是否为闰年now.isLeapYear();

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