时间工具类

package com.qiyuan.util;

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

public class getTime {

    public static String getYesterday(){
        Date dNow = new Date();   //当前时间
        Date dBefore = new Date();
        Calendar calendar = Calendar.getInstance();  //得到日历
        calendar.setTime(dNow);//把当前时间赋给日历
        calendar.add(Calendar.DAY_OF_MONTH, -1);  //设置为前一天
        dBefore = calendar.getTime();   //得到前一天的时间
        String yesterdayTime = new SimpleDateFormat("yyyy年MM月dd日").format(dBefore);
        return yesterdayTime;
    }
    
    
    public static void main(String[] args) {
        System.out.println(getTime.getYesterday());
    }
}