LocalDate 에서 LocalDateTime으로 변환

import java.time.LocalDate;
import java.time.LocalDateTime;

public class Example {
   public static void main(String[] args) {
      LocalDate date = LocalDate.parse("2017-06-22");
      System.out.println("LocalDate is: "+date);  
      
      /* Converting the LocalDate to LocalDateTime using
       * atStartOfDay() method. This method adds midnight 
       * time (start of the day time) with the local date.
       */
      LocalDateTime localDateTime1 = date.atStartOfDay();
      System.out.println("LocalDateTime Start of the Day: "+
      localDateTime1);  
      
      /* The method atTime(int hour, int minutes) is useful when
       * we need to append the exact hour and minutes to the date
       * to convert it into a LocalDateTime. The time is in 24 hour
       * format
       */
      LocalDateTime localDateTime2 = date.atTime(20,16);
      System.out.println("LocalDateTime for given hour and min: "+
      localDateTime2); 
      
      /* atTime(int hour, int minutes, int seconds)
       * hour - the hour-of-day, value range from 0 to 23.
       * minute - the minute-of-hour, value range from 0 to 59.
       * second - the second-of-minute, value range from 0 to 59.
       */
      LocalDateTime localDateTime3 = date.atTime(20,16, 40);
      System.out.println("LocalDateTime for given hour, min, seconds: "+
      localDateTime3);
      
      /* atTime(int hour, int minutes, int seconds, int nanoseconds)
       * hour - the hour-of-day, value range from 0 to 23.
       * minute - the minute-of-hour, value range from 0 to 59.
       * second - the second-of-minute, value range from 0 to 59.
       * nanoOfSecond - the nano-of-second, value range from 0 to 999,999,999
       */
      LocalDateTime localDateTime4 = date.atTime(20,16, 40, 1600);
      System.out.println("LocalDateTime for given hr, min, sec, nanoseconds: "+
      localDateTime4);
   }
}