java 获取昨天日期

Posted 2020-10-30 星朝

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                                            java 获取昨天日期                    </a>
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转自：http://blog.sina.com.cn/s/blog_6d416c1e01019zod.html

取昨天的日期，本想的截出来日期减一就好了。又一想不对，如果今天是一号怎么办？
    现有两个办法
1：老方法

  Date as = new Date(new Date().getTime()-24*60*60*1000);
  SimpleDateFormat matter1 = new SimpleDateFormat("yyyy-MM-dd");
  String time = matter1.format(as);
  System.out.println(time);
  取出数字型的时间  再减去24*60*60*1000，就得到昨天的时间了；
这个有点过时了！
2：Calendar   cal   =   Calendar.getInstance();
  cal.add(Calendar.DATE,   -1);
  String yesterday = new SimpleDateFormat( "yyyy-MM-dd ").format(cal.getTime());
  System.out.println(yesterday);
这个方法很方便，年月日都可以随心所欲的变！
3，用apache的DateUtils（ 需要 import org.apache.commons.lang.time.DateUtils;）
  Date currentTime = AppUtils.getCurrentDate();
  //获取昨天时间
  Date backupTime=DateUtils.addDays(currentTime, -1);
 
4.sql 查询条件包含时间的处理方法：
select * from TBIMC1 where CREATE_DATE_<to_date( to_char(sysdate-1,‘yyyy-mm-dd‘),‘yyyy-mm-dd‘)

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