php - Is mysql datetime not compatible with strtotime()? -

i'm passing function mysql datetime , returning nothing. mysql datetime not compatible strtotime()? assume foreach loop ending , return variable not being called, why?

function timeago($time) {     $time = time() - strtotime($time); // time since moment      $tokens = array (         1 => 'second',         60 => 'minute',         3600 => 'hour',         86400 => 'day',         604800 => 'week',         2592000 => 'month',         31536000 => 'year'     );      foreach ($tokens $unit => $text) {         if ($time < $unit) continue;         $numberofunits = floor($time / $unit);         return $numberofunits.' '.$text.(($numberofunits>1)?'s':'').' ago';     } } 

update code gets database, there no quotes in datetime string.

while ($row = mysqli_fetch_assoc($result)) {     $commenttime = $row["time"];     $commentcomment = $row["comment"];     $commentcommenter = $row["commenter"];  }  

and code echo it: echo '<h3 class="party-time">'.timeago($commenttime).'</h3>';

the problem timezone issue. manually setting date in sql server using set datetime local time, server's timezone -3 hours, causing issues.