PHP怎么按日期查询

PHP如何按日期查询
MYSQL里字段addtime为时间戳
我现在须要这样查询
xx.php?u=20130328&page=1 &page=这个用来分页
这样查询20130328或20130329这一天数据

include "../include/song.inc.php";

$key = $_GET['u'];

if($_GET["page"]){

    $page=$_GET["page"];#获取要显示的页码

}else{

    $page=1;#没有参数传入时，显示第一页

}

$col=20;#每页显示记录条数

$p=($page-1)*$col;

$runSql = mysql_query("select * from cmsdj_song where uid = '$key' order by id desc limit ".$p.",".$col."");

while($row = mysql_fetch_array($runSql))

{

//下面这些是调用值

$sid=$row['id'];

$suid=$row['uid'];

$supip=$row['upip'];

$name=$row['name'];

$sname=substr($name,0,30);

$sfile=$row['file'];

$surl=$row['url'];

$swjdx=$row['wjdx'];

$stime=date('Y-m-d H:i:s',$row['addtime']);

//$b64file=base64_encode($surl);

?>

















 
'> 
'>
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}

?>     


$col=20;#每页显示记录条数

$count=mysql_query("select id from cmsdj_song where uid like '%$key%'");#取得记录总条数

$num = mysql_num_rows($count)/$col;#计算页数

$nnx = mysql_num_rows($count);#计算页数

$num=ceil($num);#无条件小数进位确定总页数

mysql_close();

?>

------解决方案--------------------
FROM_UNIXTIME() UNIX时间戳转换为日期
UNIX_TIMESTAMP() 日期转换为UNIX时间戳
------解决方案--------------------

$u = $_GET['u'];



$starttime = strtotime($u.'000000');

$endtime =  strtotime($u.'235959');



$runSql = mysql_query("select * from cmsdj_song where addtime > '$starttime' and addtime<'$endtime' order by id desc limit ".$p.",".$col."");