/* package whatever; // don't place package name! */
 
import java.time.*;
import java.lang.*;
import java.time.format.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		DateTimeFormatter formatter = new DateTimeFormatterBuilder()
    .append(DateTimeFormatter.ISO_LOCAL_DATE)
    .appendLiteral(' ')
    .append(DateTimeFormatter.ISO_LOCAL_TIME)
    .toFormatter();
 
LocalDateTime dt = LocalDate.parse("2018-03-21 00:00:00.0", formatter)
   .atTime(LocalTime.of(23, 18, 19));
 
System.out.println(dt.format(formatter));
	}
}

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