DateTimeZone question

[Jeison Rengifo]

Hi

i have some problems with DateTimeZone class, i have an aplication in
windows server and it works fine, but i need to migrate to linux server
(hosting), and it doesn't work and i don't know why . can you help me
please.

Thanks

add source code

Best Regards

Jeison

function of_localtimetogmt($localtime,$timezone)
 {
    $timezoneinfo = new DateTimeZone($timezone);
    $arraytime = $timezoneinfo->getTransitions();
    $i = -1;
    $indice=0;
    foreach ($arraytime as $transicion)
    {
     $i++;
     if($transicion['ts'] - $arraytime[$i]['offset']>=$localtime)
      {
       $indice=$i-1;
       break;
      }

    }
    $newtime = $localtime-$arraytime[$indice]['offset'];
    return $newtime;
 }