Java8常用时间方法（LocalDateTime操作）

r囧r小猫 2023-10-15 20:49 3阅读 0赞

import java.time.Duration;
    import java.time.LocalDate;
    import java.time.LocalDateTime;
    import java.time.Period;
    import java.time.format.DateTimeFormatter;
    
    public class java8Time {
        public static void main(String[] args) {
            //现在时间
            System.out.println("----------------现在时间------------------");
            System.out.println(LocalDateTime.now());
            //格式化
            System.out.println("----------------格式化------------------");
            System.out.println(LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
            //减10s
            System.out.println("-----------------减10s-----------------");
            System.out.println(LocalDateTime.now().minusSeconds(10).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
            //加10s
            System.out.println("------------------加10s----------------");
            System.out.println(LocalDateTime.now().minusSeconds(-10).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
            //减10个小时
            System.out.println("------------------减10个小时----------------");
            System.out.println(LocalDateTime.now().minusHours(10).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
            //减10分钟
            System.out.println("------------------减10分钟----------------");
            System.out.println(LocalDateTime.now().minusMinutes(10).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
            //减两周
            System.out.println("------------------减两周----------------");
            System.out.println(LocalDateTime.now().minusWeeks(2).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
            //减两年
            System.out.println("------------------减两年----------------");
            System.out.println(LocalDateTime.now().minusYears(2).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
            //构建一个时间
            System.out.println("------------------构建一个时间----------------");
            System.out.println(LocalDateTime.of(2021, 1, 1, 1, 1, 1, 1));
    
            //加10s
            System.out.println("-----------------加10s-----------------");
            System.out.println(LocalDateTime.now().plusSeconds(10).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
            //加10个小时
            System.out.println("------------------加10个小时----------------");
            System.out.println(LocalDateTime.now().plusHours(10).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
            //加10分钟
            System.out.println("------------------加10分钟----------------");
            System.out.println(LocalDateTime.now().plusMinutes(10).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
            //加两周
            System.out.println("------------------加两周----------------");
            System.out.println(LocalDateTime.now().plusWeeks(2).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
            //加两年
            System.out.println("------------------加两年----------------");
            System.out.println(LocalDateTime.now().plusYears(2).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
            //修改小时
            System.out.println("------------------修改小时--------------------");
            System.out.println(LocalDateTime.now().withHour(20));
    
            //修改年份
            System.out.println("------------------修改年份--------------------");
            System.out.println(LocalDateTime.now().withYear(2018));
            //时间比较
            System.out.println("---------------------时间比较----Duration----------------");
            //毫秒
            System.out.println(Duration.between(LocalDateTime.now(), LocalDateTime.now().plusSeconds(360000)).toMillis());
            //分钟
            System.out.println(Duration.between(LocalDateTime.now(), LocalDateTime.now().plusSeconds(360000)).toMinutes());
            //小时
            System.out.println(Duration.between(LocalDateTime.now(), LocalDateTime.now().plusSeconds(360000)).toHours());
            //天
            System.out.println(Duration.between(LocalDateTime.now(), LocalDateTime.now().plusSeconds(360000)).toDays());
    
    
            System.out.println("-------------------------Period-------------------------");
            LocalDate localDate = LocalDate.of(2021, 1, 1);
            //毫秒
            System.out.println(Period.between(localDate, localDate.plusDays(2)).getDays());
            System.out.println(Period.between(localDate, localDate.plusDays(2)).getMonths());
            System.out.println(Period.between(localDate, localDate.plusDays(2)).getYears());
    
            System.out.println("---------------判断两个时间前后----------------------");
            LocalDateTime a = LocalDateTime.of(2012, 6, 30, 12, 00);
            LocalDateTime b = LocalDateTime.of(2012, 7, 1, 12, 00);
            boolean after = a.isAfter(b);
            boolean before = a.isBefore(b);
            System.out.println(after);
            System.out.println(before);
    
    
        }
    
    }