jquery - how to increase a static number automatically everyday using php -

i use wordpress , have static number field taken sql query.

<p class="counter-number">843</p> 

i increase number everyday. example when page loaded default number 843 next day should show 844 day after should show 845.

how can this? prefer php if possible can use jquery.

<?php      $now = time();      $your_date = strtotime("2010-01-01"); //starting date      $datediff = floor(($now - $your_date)/(60*60*24)); ?> <p class="counter-number"><?=$datediff?></p> 

code taken finding number of days between 2 dates

this way show difference starting date now, in days.