Java获取当前时间的前一天

2019独角兽企业重金招聘Python工程师标准>>>

1.获取当前时间的前一天

  SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");

  Date date = new Date();

  Calendar now = Calendar.getInstance();
  now.setTime(date);

  System.out.println(sdf.format(now.getTime()));

  now.add(Calendar.DAY_OF_MONTH, -1);


  System.out.println(now.getTime());
        
  System.out.println(sdf.format(now.getTime()));

运行结果：

2017-09-21
Wed Sep 20 14:37:24 CST 2017
2017-09-20

2.Date转string

 SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");

 Date date = new Date();


 System.out.println(sdf.format(date));
 System.out.println(sdf.format(date).getClass().toString());

运行结果：

2017-09-21
class java.lang.String

3.String转Date

 SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");


 String dateStr ="2017-09-21";
 Date date = sdf.parse(dateStr);


 System.out.println(date);
 System.out.println(date.getClass().toString());

运行结果：

Thu Sep 21 00:00:00 CST 2017
class java.util.Date

 

转载于:https://my.oschina.net/u/2263272/blog/1541129