DATE类型的加减

阳光穿透心脏的1/2处 2022-06-14 08:15 236阅读 0赞

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));
    		
    	}
    }