LocalDateTime.now()時間處理jdk1.8日期便捷處理類java.time.LocalDateTime;

        //獲取當前時間
        System.out.println(LocalDateTime.now());
        //獲取當前時間時分秒
        System.out.println(LocalDateTime.now().toLocalTime());
        //獲取當前時間年月日
        System.out.println(LocalDateTime.now().toLocalDate());
        //獲取當前時間20天之前
        System.out.println(LocalDateTime.now().minusDays(20));
        //獲取當前時間20天之后
        System.out.println(LocalDateTime.now().plusDays(20));
        //獲取當前時間60天之前
        System.out.println(LocalDateTime.now().minusDays(60));
        //所有minus開頭都是之前    plus開頭都是之后
        
        //比較大小
        System.out.println(LocalDateTime.now().compareTo(LocalDateTime.now().plusDays(2)));

        //實例化方式   以及比較大小
        Duration between = Duration.between(LocalDateTime.of(1993,3,14,0,0), LocalDateTime.now());
        Duration between2 = Duration.between(LocalDateTime.of(1993,3,14,0,0), LocalDateTime.now());
        System.out.println(between.toDays());
        System.out.println(between2.toDays());

 

java.time.Duration duration = java.time.Duration.between(LocalDateTime   startTime,  LocalDateTime  endTime );


例如：     duration.toMinutes()    //兩個時間差的分鍾數

toNanos()//納秒

toMillis()//毫秒

toMinutes()//分鍾

toHours()//小時

toDays()//天數

 

        //獲取當前是第幾日
        System.out.println(LocalDateTime.now().getDayOfMonth());
        //獲取當前周幾
        System.out.println(LocalDateTime.now().getDayOfWeek().getValue());
        //獲取當前是今年第幾天
        System.out.println(LocalDateTime.now().getDayOfYear());

 

//獲取毫秒數
Long milliSecond = LocalDateTime.now().toInstant(ZoneOffset.of("+8")).toEpochMilli();

 

1.獲取當前年月日的字符串

String ymd = LocalDate.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));