<?php $timeg = date( 'g:ia', current_time( 'timestamp', 0 ));
$timem = '12:54pm';
if ($timem == $timeg) 
{

$to = 'abc@gmail.com';
$subject = 'Post Published by Author';
$headers = 'From: admin <admin@urdutahzeeb.com>' . "rn";  
$message = 'your';

   wp_mail($to, $subject, $message, $headers);

}

?>