how to synchronize the time on PHP and MySQL

<?php
mysql_connect("localhost","root","") or die("Error");
$sql = "SELECT UNIX_TIMESTAMP() as time";
$test = mysql_query($sql);
$timenow= mysql_fetch_assoc($test);
echo "Time in MySQL = " . date("d-m-Y H:i:s",$timenow['time']);
echo '<br />';
echo "Time in PHP = " .date("d-m-Y H:i:s");
?>