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("時(shí): " + 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("當(dāng)前時(shí)間毫秒數(shù)：" + 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定義的格式一樣  
28.         Date today = sdf.parse(str);  
29.         System.out.println("字符串轉(zhuǎn)成日期：" + today);  
30.     }  
31. }  

package com.ob;

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

public class DateTest {

public static void main(String[] args) throws ParseException {
Calendar now = Calendar.getInstance();
System.out.println("年: " + now.get(Calendar.YEAR));
System.out.println("月: " + (now.get(Calendar.MONTH) + 1) + "");
System.out.println("日: " + now.get(Calendar.DAY_OF_MONTH));
System.out.println("時(shí): " + now.get(Calendar.HOUR_OF_DAY));
System.out.println("分: " + now.get(Calendar.MINUTE));
System.out.println("秒: " + now.get(Calendar.SECOND));
System.out.println("當(dāng)前時(shí)間毫秒數(shù)：" + now.getTimeInMillis());
System.out.println(now.getTime());

Date d = new Date();
System.out.println(d);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateNowStr = sdf.format(d);
System.out.println("格式化后的日期：" + dateNowStr);

String str = "2012-1-13 17:26:33"; //要跟上面sdf定義的格式一樣
Date today = sdf.parse(str);
System.out.println("字符串轉(zhuǎn)成日期：" + today);
}
}

輸出結(jié)果：

年: 2012
月: 1
日: 13
時(shí): 17
分: 28
秒: 19
當(dāng)前時(shí)間毫秒數(shù)：1326446899902
Fri Jan 13 17:28:19 CST 2012
Fri Jan 13 17:28:19 CST 2012
格式化后的日期：2012-01-13 17:28:19
字符串轉(zhuǎn)成日期：Fri Jan 13 17:26:33 CST 2012