Java获取当前时间的年月日方法详解编程语言

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("时: " + 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("当前时间毫秒数：" + 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定义的格式一样   
            Date today = sdf.parse(str);   
            System.out.println("字符串转成日期：" + today);   
        }   
    }

输出结果：

年: 2012

月: 1

日: 13

时: 17

分: 28

秒: 19

当前时间毫秒数：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

字符串转成日期：Fri Jan 13 17:26:33 CST 2012