时间功能无法正确计算

My time calculations are not correct I have a time.php that is called in my profile.php to calculate the last time a message was sent etc

I have the following line that calls the function time_passed for the row time

echo "time_passed"($row['time']);

Here is the CODE for calculating time

   <?php

  // DISPLAYS COMMENT POST TIME AS "1 year, 1 week ago" or "5 minutes, 7    seconds ago", etc...
 function time_passed($timestamp){
//type cast, current time, difference in timestamps
$timestamp      = (int) $timestamp;
$current_time   = time();
$diff           = $current_time - $timestamp;

//intervals in seconds
$intervals      = array (
    'year' => 31556926, 'month' => 2629744, 'week' => 604800, 'day' => 86400, 'hour' => 3600, 'minute'=> 60
);

//now we just find the difference
if ($diff == 0)
{
    return 'just now';
}    

if ($diff < 60)
{
    return $diff == 1 ? $diff . ' second ago' : $diff . ' seconds ago';
}        

if ($diff >= 60 && $diff < $intervals['hour'])
{
    $diff = floor($diff/$intervals['minute']);
    return $diff == 1 ? $diff . ' minute ago' : $diff . ' minutes ago';
}        

if ($diff >= $intervals['hour'] && $diff < $intervals['day'])
{
    $diff = floor($diff/$intervals['hour']);
    return $diff == 1 ? $diff . ' hour ago' : $diff . ' hours ago';
}    

if ($diff >= $intervals['day'] && $diff < $intervals['week'])
{
    $diff = floor($diff/$intervals['day']);
    return $diff == 1 ? $diff . ' day ago' : $diff . ' days ago';
}    

if ($diff >= $intervals['week'] && $diff < $intervals['month'])
{
    $diff = floor($diff/$intervals['week']);
    return $diff == 1 ? $diff . ' week ago' : $diff . ' weeks ago';
}    

if ($diff >= $intervals['month'] && $diff < $intervals['year'])
{
    $diff = floor($diff/$intervals['month']);
    return $diff == 1 ? $diff . ' month ago' : $diff . ' months ago';
}    

if ($diff >= $intervals['year'])
{
    $diff = floor($diff/$intervals['year']);
    return $diff == 1 ? $diff . ' year ago' : $diff . ' years ago';
}
}

?>

The result is as follows

My table is

The time is inserted in the following format

The time gets inserted automatically when a query is ran, then I show back the results in a table above but its says 46 years ago , What is possible causing this ? Thanks