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

public class NowString {
public static void main(String[] args) { 
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式
System.out.println(df.format(new Date()));// new Date()为获取当前系统时间
}
}

String sqlst = "select convert(varchar(10),bookDate,126) as convertBookDate from roomBook where bookDate between '2007-4-10' and '2007-4-25'";

System.out.println(rs.getString("convertBookDate"));

import java.util.Date; 
import java.util.Calendar; 

import java.text.SimpleDateFormat; 

public class TestDate{ 
public static void main(String[] args){ 
Date now = new Date(); 
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");//可以方便地修改日期格式


String hehe = dateFormat.format( now ); 
System.out.println(hehe); 

Calendar c = Calendar.getInstance();//可以对每个时间域单独修改
int year = c.get(Calendar.YEAR); 
int month = c.get(Calendar.MONTH); 
int date = c.get(Calendar.DATE); 
int hour = c.get(Calendar.HOUR_OF_DAY); 
int minute = c.get(Calendar.MINUTE); 
int second = c.get(Calendar.SECOND); 
System.out.println(year + "/" + month + "/" + date + " " +hour + ":" +minute + ":" + second); 
} 
}

SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");

java.util.Date time=null;
try {
  time= sdf.parse(sdf.format(new Date()));

} catch (ParseException e) {

  e.printStackTrace();
}