时间初始化
LocalDateTime基本使用
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//获取当前时间
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LocalDateTime nowTime= LocalDateTime.now();
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System.out.println(
"现在时间"+nowTime);
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//自定义时间 of(int year, int month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond)
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LocalDateTime endTime = LocalDateTime.of(
2020,
5,
20,
5,
20,
10,
00);
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System.out.println(
"设定时间"+endTime);
时间比较
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//比较 现在的时间 比 设定的时间 之前 返回的类型是Boolean类型
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boolean isBefore = nowTime.isBefore(endTime);
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System.out.println(
"现在的时间 比 设定的时间 之前"+isBefore);
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//比较 现在的时间 和 设定的时候 相等 返回类型是Boolean类型
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boolean euqal =nowTime.equals(endTime);
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System.out.println(
"现在的时间 和 设定的时候 相等"+euqal);
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//比较 现在的时间 比 设定的时间 之后 返回的类型是Boolean类型
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boolean isAfter = nowTime.isAfter(endTime);
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System.out.println(
"现在的时间 比 设定的时间 之后"+isAfter);
时间获取
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// 获取当前时间
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int year = nowTime.getYear();
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int monthValue = nowTime.getMonthValue();
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int dayofMonth = nowTime.getDayOfMonth();
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int hour = nowTime.getHour();
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int minute = nowTime.getMinute();
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int second = nowTime.getSecond();
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System.out.println(
"获得时间：" + year +
"年" +monthValue+
"月"+dayofMonth+
"日" + hour+
"时"+minute+
"分"+second+
"秒");
// 打印当前时间的
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DayOfWeek dayofWeek = nowTime.getDayOfWeek();
//获取星期几
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System.out.println(
"获得星期:"+dayofWeek);
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int dayofYear = nowTime.getDayOfYear();
//获取当前日子为年的第几天
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System.out.println(
"全年:"+dayofYear+
"天");
时间操作
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// 获取一年之前.minusYears(1) 这个 1 代表一年之前，如果是2就是两年之前
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LocalDateTime minusYears = nowTime.minusYears(
1);
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System.out.println(minusYears);
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LocalDateTime plusYears = nowTime.plusYears(
1);
//一年之后
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System.out.println(plusYears);
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LocalDateTime minusMonths = nowTime.minusMonths(
1);
//一个月前
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System.out.println(minusMonths);
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LocalDateTime plusMonths = nowTime.plusMonths(
1);
//一个月后
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System.out.println(plusMonths);
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LocalDateTime BeforeWeek = nowTime.minusWeeks(
1);
//一个星期前
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System.out.println(BeforeWeek);
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LocalDateTime AfterWeek = nowTime.plusWeeks(
1);
//一个星期后
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System.out.println(AfterWeek);
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LocalDateTime minusDays = nowTime.minusDays(
1);
//一天前
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System.out.println(minusDays);
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LocalDateTime plusDays = nowTime.plusDays(
1);
//一天后
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System.out.println(plusDays);
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LocalDateTime minusHours = nowTime.minusHours(
1);
//一个小时前
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System.out.println(minusHours);
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LocalDateTime plusHours = nowTime.plusHours(
1);
//一个小时后
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System.out.println(plusHours);
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LocalDateTime minusMinutes = nowTime.minusMinutes(
1);
//一分钟前
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System.out.println(minusMinutes);
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LocalDateTime plusMinutes = nowTime.plusMinutes(
1);
//一分钟后
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System.out.println(plusMinutes);
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LocalDateTime minusSeconds = nowTime.minusSeconds(
1);
//一秒前
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System.out.println(minusSeconds);
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LocalDateTime plusSeconds = nowTime.plusSeconds(
1);
//一秒后
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System.out.println(plusSeconds);
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LocalDateTime minusTime = nowTime.minus(
23, ChronoUnit.MONTHS);
//当前时间减少23个月
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System.out.println(minusTime);
时间做差
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//计算时间差
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Duration duration = Duration.between(nowTime,endTime);
//时间差
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long durationdays = duration.toDays();
//相差的天数
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System.out.println(
"duration相差"+durationdays+
"天");
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long durationhours = duration.toHours();
//相差的小时数
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System.out.println(
"duration相差"+durationhours+
"小时");
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long durationminutes = duration.toMinutes();
//相差的分钟数
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System.out.println(
"duration相差"+durationminutes+
"分钟");
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long durationmillis = duration.toMillis();
//相差毫秒数
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System.out.println(
"duration相差"+durationmillis+
"毫秒");
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long durationnanos = duration.toNanos();
//相差的纳秒数
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System.out.println(
"duration相差"+durationnanos+
"纳秒");
Period时间差
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Period period = Period.between(nowTime.toLocalDate(),endTime.toLocalDate());
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int periodyear = period.getYears();
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System.out.println(
"period相差"+periodyear+
"年");
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int periodmonth = period.getMonths();
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System.out.println(
"period相差"+periodmonth+
"月");
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int perioddays= period.getDays();
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System.out.println(
"period相差"+perioddays+
"日");
获得特殊时间
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//根据需求需要取得当天的零点
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LocalDateTime today_start = LocalDateTime.of(LocalDate.now(), LocalTime.MIN);
//当天零点
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System.out.println(today_start);
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LocalDateTime today_end = LocalDateTime.of(LocalDate.now(), LocalTime.MAX);
//获取当天结束时间
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System.out.println(today_end);
LocalDataTime转化
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//LocalDataTIme的转化
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String localDataTimeString= nowTime.format(DateTimeFormatter.ofPattern(
"yyyy-MM-dd HH:mm:ss"));
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LocalDateTime StringLocalDataTime = LocalDateTime.parse(
"2017-09-28 17:07:05",DateTimeFormatter.ofPattern(
"yyyy-MM-dd HH:mm:ss"));
//String转化为LocalDataTime
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System.out.println(
"LocalDateTime转成String类型的时间："+localDataTimeString);
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System.out.println(
"String类型的时间转成LocalDateTime："+StringLocalDataTime);
Data转化
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//Date的转化
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Date date = Date.from(nowTime.atZone(ZoneId.systemDefault()).toInstant());
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LocalDateTime dateTime = LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault());
//转化为LocalDataTime
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System.out.println(dateTime);
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String dataString = nowTime.format(DateTimeFormatter.ofPattern(
"yyyy-MM-dd HH:mm:ss"));
//转为为String
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System.out.println(dataString);
