1 package com.ob;  
 2   
 3 import java.text.ParseException;  
 4 import java.text.SimpleDateFormat;  
 5 import java.util.Calendar;  
 6 import java.util.Date;  
 7   
 8 public class DateTest {  
 9   
10     public static void main(String[] args) throws ParseException {  
11         Calendar now = Calendar.getInstance();  
12         System.out.println("年: " + now.get(Calendar.YEAR));  
13         System.out.println("月: " + (now.get(Calendar.MONTH) + 1) + "");  
14         System.out.println("日: " + now.get(Calendar.DAY_OF_MONTH));  
15         System.out.println("时: " + now.get(Calendar.HOUR_OF_DAY));  
16         System.out.println("分: " + now.get(Calendar.MINUTE));  
17         System.out.println("秒: " + now.get(Calendar.SECOND));  
18         System.out.println("当前时间毫秒数：" + now.getTimeInMillis());  
19         System.out.println(now.getTime());  
20   
21         Date d = new Date();  
22         System.out.println(d);  
23         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
24         String dateNowStr = sdf.format(d);  
25         System.out.println("格式化后的日期：" + dateNowStr);  
26           
27         String str = "2012-1-13 17:26:33";  //要跟上面sdf定义的格式一样  
28         Date today = sdf.parse(str);  
29         System.out.println("字符串转成日期：" + today);  
30     }  
31 }