[JAVA] LocalDate, LocalDateTime 사용법

package test_java;
 
import java.io.IOException;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.Period;
import java.time.format.DateTimeFormatter;
 
public class Main 
{
 
    public static void main(String[] args) throws IOException
    {
             
        System.out.println("오늘 날짜 :  " + LocalDate.now()); // 2018-11-05
       
        System.out.println("지금 :  " + LocalDateTime.now()); // 2018-11-05T21:25:19.239
        
        System.out.println("지정 날짜 출력 :  " + LocalDate.of(1991, 4 ,17)); // 1991-04-17
        
        System.out.println("지정 날짜+시간 출력 :  " + LocalDateTime.of(2015, 4, 17, 13, 15, 50)); // 2015-04-17T13:15:50
        
        System.out.println("String ===> LocalDate :  " + LocalDate.parse("2018-01-03"));  // 2018-01-03
        
        LocalDate localDate2 = LocalDate.of(2018, 12, 25);
        System.out.println("LocalDate ==> String :  "+ localDate2.format(DateTimeFormatter.ISO_DATE)); //  2018-12-25
        
        String startDate="2018-01-31";
        String endDate="2018-02-01";
        System.out.println("두 날짜사이의 월간격 : " + Period.between(LocalDate.parse(startDate), LocalDate.parse(endDate)).getMonths()); // 0
        System.out.println("두 날짜사이의 일간격 : " + Period.between(LocalDate.parse(startDate), LocalDate.parse(endDate)).getDays()); // 1
        System.out.println("시작날짜로 부터 3개월 이후  : " + LocalDate.parse(startDate).plusMonths(3)); // 2018-04-30
        
    }
    
}// CLASS END