格式化时间yyyy-MM-dd获取

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

public class test2 {

    public static void main(String[] args) {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        c.setTime(new Date());
        Date end = c.getTime();
        String dqrq= format.format(end);//当前日期
        System.out.println(dqrq);

        c.add(Calendar.DATE, -1);
        Date start = c.getTime();
        String qyt= format.format(start);//前一天
        System.out.println(qyt);

        c.add(Calendar.MONTH, -1);
        Date start1 = c.getTime();
        String startDay = format.format(start1);//前一月
        System.out.println(startDay);

        c.add(Calendar.YEAR, -1);
        Date start2 = c.getTime();
        String startDay3 = format.format(start2);//前一年

        System.out.println(startDay3);
    }
}