php 格式化时间戳

$day =  strtotime("-1 month 00:00:00"); echo date("Y-m-d H:i:s",$day); echo "<hr />";
    
    $day1 = strtotime("-1 month -1 day 00:00:00"); echo date("Y-m-d H:i:s",$day1); echo "<hr />";

SELECT FROM_UNIXTIME(inputtime,'%Y-%m-%d %H:%i:%s') FROM tablename WHERE 

FROM_UNIXTIME(inputtime,'%Y-%m-%d') <= '2014-10-08' 

AND FROM_UNIXTIME(inputtime,'%Y-%m-%d') >= '2014-10-07';


$day =  strtotime("-1 month 00:00:00"); echo da