php时间的操作，前一天，后一天时间的获取

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<?php   date_default_timezone_set( 'PRC' ); //默认时区   echo "今天:" , date ( "Y-m-d" ,time()), "<br>" ;   echo "今天:" , date ( "Y-m-d" , strtotime ( "18 june 2008" )), "<br>" ;   echo "昨天:" , date ( "Y-m-d" , strtotime ( "-1 day" )), "<br>" ;   echo "明天:" , date ( "Y-m-d" , strtotime ( "+1 day" )), "<br>" ;   echo "一周后:" , date ( "Y-m-d" , strtotime ( "+1 week" )), "<br>" ;   echo "一周零两天四小时两秒后:" , date ( "Y-m-d G:H:s" , strtotime ( "+1 week 2 days 4 hours 2 seconds" )), "<br>" ;   echo "下个星期四:" , date ( "Y-m-d" , strtotime ( "next Thursday" )), "<br>" ;   echo "上个周一:" . date ( "Y-m-d" , strtotime ( "last Monday" )). "<br>" ;   echo "一个月前:" . date ( "Y-m-d" , strtotime ( "last month" )). "<br>" ;   echo "一个月后:" . date ( "Y-m-d" , strtotime ( "+1 month" )). "<br>" ;   echo "十年后:" . date ( "Y-m-d" , strtotime ( "+10 year" )). "<br>" ;   ?>

距离某天的时间（php实现）
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$date1 = strtotime ( '2011-04-30' );  //把日期转换成时间戳 $date2 = time(); //取当前时间的时间戳   $nowtime = strftime ( "%y年-%m月-%d日 " , $date2 ); //格式化输出日期 $days = round (( $date1 - $date2 )/3600/24);  //四舍五入 echo "今天是<font color=\"red\">" . $nowtime . "</font>" ; echo "<br/>距" . strftime ( "%y年-%m月-%d日 " , $date1 ). "还有<font colr=\"red\">" . $days . "</font>天" ;