java常用类--时间日期类

package cn.usts.edu.fly.DateAndDateFormat;

import com.sun.org.apache.xerces.internal.impl.dv.xs.YearMonthDV;

import java.time.*;


public class DateDemo {
    public static void main(String[] args) {
        LocalTime time = LocalTime.now();
        System.out.println(time);// 时间 16:51:42.206

        LocalDate date = LocalDate.now();
        System.out.println(date);//当前年月日 2021-10-31

        LocalDate date1 = date.plusDays(1);
        System.out.println("当前时间加1天是"+date1);

        LocalDateTime now = LocalDateTime.now();
        System.out.println(now);

        System.out.println("当前年"+Year.now());
        System.out.println("当前年月"+ YearMonth.now());//2021-10
        System.out.println("当前月日"+ MonthDay.now());// --10-31
    }
}

package cn.usts.edu.fly.DateAndDateFormat;

import java.text.SimpleDateFormat;
import java.util.Date;


public class SimpleDateFormatDemo {
    public static void main(String[] args) {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("现在的时间是:yyyy-MM-dd HH:mm:ss");
        System.out.println(simpleDateFormat.format(new Date()));// 今天是:2021-10-31 17:11:47

    }
}