获取php中两个日期之间的天数[关闭]

我试图获取两个日期之间的天数，但返回的结果不正确。这是我的尝试；

  $t_time = get_the_time( __( 'Y/m/d g:i:s A', 'woocommerce' ), $post ); //date of post
    $start_date = new DateTime(); //current date
    $since_start = $start_date->diff(new DateTime($t_time)); //difference
    echo $since_start->d; //number of days

我哪里做错了？它适用于前几篇文章，但当月份发生变化时它会重新启动。

尝试这个

<?php

     $now = time(); // Current time 
     $your_date = strtotime("2013-12-01"); // This will parses an English textual datetime into a Unix timestamp
     $datediff = abs($now - $your_date);// Gives absolute Value 
     echo floor($datediff/(60*60*24)); //Returns the lowest value by rounding down value 

?>