日期操作类

import java.util.Date;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.GregorianCalendar;
class DateTime
{
	Calendar c = null;
	StringBuffer sb = new StringBuffer();
	public DateTime()
	{
		c = new GregorianCalendar();
	}
	public String getDate()
	{
		sb.append("现在是北京时间");
		sb.append(c.get(Calendar.YEAR));
		sb.append("年");
		sb.append(add((c.get(Calendar.MONTH)+1),2));
		sb.append("月");
		sb.append(add(c.get(Calendar.DAY_OF_MONTH),2));
		sb.append("日");
		sb.append(add(c.get(Calendar.HOUR_OF_DAY),2));
		sb.append("时");
		sb.append(add(c.get(Calendar.MINUTE),2));
		sb.append("分");
		sb.append(add(c.get(Calendar.SECOND),2));
		sb.append("秒");
		sb.append(add(c.get(Calendar.MILLISECOND),3));
		sb.append("毫秒");
		return sb.toString();
	}
	public StringBuffer add(int num,int len)
	{
		StringBuffer sb = new StringBuffer();
		sb.append(num);
		while(sb.length()<len)
		{
			sb.insert(0,"0");
		}
		return sb;
	}
	
	
}
public class override
{
	public static void main(String args[])
	{
		SimpleDateFormat sdf1 = new SimpleDateFormat("现在是北京时间yyyy年MM月dd日 E aaa hh时mm分ss秒SSS毫秒");
		System.out.println(sdf1.format(new Date()));
		System.out.println(new DateTime().getDate());
		SimpleDateFormat sdf2 = new SimpleDateFormat("现在是北京时间yyyy年MM月dd日HH时mm分ss秒SSS毫秒");
		try{System.out.println(sdf1.format(sdf2.parse(new DateTime().getDate())));}catch(Exception e){System.out.println("!!!");}
		
	}
}