Java 시간 차이 구하기(날짜 비교)

Java 시간 차이 구하기(날짜 비교)

날짜 시간 관련 로직을 구현시 Calendar 클래스를 많이 사용하고 있습니다.
Calendar클래스를 이용한 시간 차이를 구하는 간단한 예제입니다.

[소스]

import java.text.SimpleDateFormat;
import java.util.Calendar;

public class TimeCalculate {

	public static void main(String[] args) {
		
		SimpleDateFormat hhmmssSSS = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
		
		Calendar before = Calendar.getInstance();
		System.out.println("BEFORE : " + hhmmssSSS.format(before.getTime()));
		
		try{Thread.sleep(5000);}catch(Exception e) {}
		
		Calendar after = Calendar.getInstance();
		System.out.println("AFTER : " + hhmmssSSS.format(after.getTime()));
		
		int diffHour = after.get(Calendar.HOUR_OF_DAY) - before.get(Calendar.HOUR_OF_DAY);
		int diffMinute = after.get(Calendar.MINUTE) - before.get(Calendar.MINUTE);
		int diffSecond = after.get(Calendar.SECOND) - before.get(Calendar.SECOND);
		int diffMillisecond = after.get(Calendar.MILLISECOND) - before.get(Calendar.MILLISECOND);
		
		System.out.println("시 : " + diffHour);
		System.out.println("분 : " + diffMinute);
		System.out.println("초 : " + diffSecond);
		System.out.println("밀리세컨드 : " + diffMillisecond);
	}
}

[결과]

 

* SimpleDateFormat 관련 예제는 아래의 포스트를 참고하세요.

https://docko.tistory.com/entry/Java-SimpleDateFormat-%ED%8C%A8%ED%84%B4?category=640361

Java SimpleDateFormat 패턴