Java日期处理

1. 1.Calendar类
2. Calendar now = Calendar.getInstance();  
3.         System.out.println("年: " + now.get(Calendar.YEAR));  
4.         System.out.println("月: " + (now.get(Calendar.MONTH) + 1) + "");  
5.         System.out.println("日: " + now.get(Calendar.DAY_OF_MONTH));  
6.         System.out.println("时: " + now.get(Calendar.HOUR_OF_DAY));  
7.         System.out.println("分: " + now.get(Calendar.MINUTE));  
8.         System.out.println("秒: " + now.get(Calendar.SECOND));  
9.         System.out.println("当前时间毫秒数：" + now.getTimeInMillis());  
10.         System.out.println(now.getTime());  
11.   
12.         Date d = new Date();  
13.         System.out.println(d);  
14.         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
15.         String dateNowStr = sdf.format(d);  
16.         System.out.println("格式化后的日期：" + dateNowStr);  
17.           
18.         String str = "2012-1-13 17:26:33";  //要跟上面sdf定义的格式一样  
19.         Date today = sdf.parse(str);  
20.         System.out.println("字符串转成日期：" + today);