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: " + 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("當前時間毫秒數：" + 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("格式化後的日期：" + 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("字串轉成日期：" + today);
	}
}
 

輸出結果：

年: 2012
月: 1
日: 13
時: 17
分: 28
秒: 19
當前時間毫秒數：1326446899902
Fri Jan 13 17:28:19 CST 2012
Fri Jan 13 17:28:19 CST 2012
格式化後的日期：2012-01-13 17:28:19
字串轉成日期：Fri Jan 13 17:26:33 CST 2012