時間格式化，生成00:00:00格式的TimeStamp時間

import java.sql.Timestamp;
import java.text.SimpleDateFormat;

public class TimeStampTest
{
    
    public static void main(String[] args)
    {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd 00:00:00");        
        long t = System.currentTimeMillis();        
        System.out.println("sdf  first = " + sdf.format(new Timestamp(t)));        
    }    
}

測試結果：
sdf  first = 2009-09-07 00:00:00