Need to show total days in html table.

I have the first date in myhpadmin table [CREATED_AT] and then todays date (not in database). Only what to show the total days in my html table, when I open the webpage.

Did get the script code from searching , but it does not show the info at all.

Not sure how to use print in the script

<td>
<?php $date = $checkSqlRow["DAYS_OLD"]; ?></td>
    <script>
            $date1 = $date = $checkSqlRow["CREATED_AT"];
            $date2 = today;
            $diff = abs(strtotime($date2) - strtotime($date1));
            $years = floor($diff / (365*60*60*24));
            $months = floor(($diff - $years * 365*60*60*24) / (30*60*60*24));
            $days = floor(($diff - $years * 365*60*60*24 - $months*30*60*60*24)/ (60*60*24));


            printf("%d days\n", $days);