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