php 時間 （年，月，星期，天，小時，秒）的查找

<?php
date_default_timezone_set( 'PRC' ); //默認時區
echo "今天:" , date ( "Y-m-d" ,time()), "<br>" ;
echo "今天:" , date ( "Y-m-d" , strtotime ( "19 june 2013" )), "<br>" ;
echo "昨天:" , date ( "Y-m-d" , strtotime ( "-1 day" )), "<br>" ;
echo "明天:" , date ( "Y-m-d" , strtotime ( "+1 day" )), "<br>" ;
echo "一週後:" , date ( "Y-m-d" , strtotime ( "+1 week" )), "<br>" ;
echo "一週零兩天四小時兩秒後:" , date ( "Y-m-d G:H:s" , strtotime ( "+1 week 2 days 4 hours 2 seconds" )), "<br>" ;
echo "下個星期四:" , date ( "Y-m-d" , strtotime ( "next Thursday" )), "<br>" ;
echo "上個週一:" . date ( "Y-m-d" , strtotime ( "last Monday" )). "<br>" ;
echo "一個月前:" . date ( "Y-m-d" , strtotime ( "last month" )). "<br>" ;
echo "一個月後:" . date ( "Y-m-d" , strtotime ( "+1 month" )). "<br>" ;
echo "十年後:" . date ( "Y-m-d" , strtotime ( "+10 year" )). "<br>" ;

//距離某天的時間（php實現）
$date1 = strtotime ( '2011-04-30' );  //把日期轉換成時間戳
$date2 = time(); //取當前時間的時間戳
$nowtime = strftime ( "%y年-%m月-%d日 " , $date2 ); //格式化輸出日期
$days = round (( $date1 - $date2 )/3600/24);  //四捨五入
echo "今天是<font color=\"red\">" . $nowtime . "</font>" ;
echo "<br/>距" . strftime ( "%y年-%m月-%d日 " , $date1 ). "還有<font colr=\"red\">" . $days . "</font>天" ;
?>