[Java] I want to calculate the difference from the date

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

public class date {

	public static void main(String[] args) {

		SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
		Date start = null;
		Date end = null;

		//Convert to Date type
		try {
			start = sdf.parse("2020/03/23 12:30:12");
			end = sdf.parse("2020/03/23 12:31:12");
		} catch (java.text.ParseException e) {
			e.printStackTrace();
		}

		long timeStart = start.getTime();
		long timeEnd = end.getTime();
		long processTime = timeEnd - timeStart;

		//millisecond
		System.out.println(processTime);
	}
}

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