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java的date类型加减

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package com.tradingplatform.dto;

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

/**
 * 用于操作时间运算的类
 * @author cc
 *
 */
public class DateOperationDto {
	/**
     * 得到几天前的时间
     * @param d
     * @param day
     * @return
     */
    public  Date getDateBefore(Date d, int day) {
        Calendar now = Calendar.getInstance();
        now.setTime(d);
        now.set(Calendar.DATE, now.get(Calendar.DATE) - day);
        return now.getTime();
    }
 
    /**
     * 得到几天后的时间
     * @param d
     * @param day
     * @return
     */
    public  Date getDateAfter(Date d, int day) {
        Calendar now = Calendar.getInstance();
        now.setTime(d);
        now.set(Calendar.DATE, now.get(Calendar.DATE) + day);
        return now.getTime();
    }
    public static void main(String[] args) throws ParseException {
    	
    	SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		Date date=new Date();
		System.out.println(sdf.format(date));
		Date addDate=new Date(date.getTime()+600000);
		System.out.println(sdf.format(addDate));
		//2017-05-07 10:32:33
		String oldTime="2017-05-07 10:35:34";
		Date oldDate=sdf.parse(oldTime);
		System.out.println(sdf.format(oldDate));
		Date newTime=new Date(oldDate.getTime()+600000);
		Date newTime1=new Date(oldDate.getTime()-10000);
		System.out.println(newTime);
		System.out.println(sdf.format(newTime));
		System.out.println(sdf.format(newTime1));
		
	}
}