timezone - from Javascript to PHP

/*Javascript*/
 var d=new Date();
 var offset = d.getTimezoneOffset()*60;
 var timestamp = Math.ceil(d / 1000); //give this to PHP
 console.log('offset:'+offset);
 console.log('timestamp:'+timestamp);
 console.log(d.show());

/*PHP*/
 $offsetServer= date_offset_get(new DateTime); //in hour
 echo "Offset server : "; echo $offsetServer; echo "\n";

 $today = new DateTime("now");
 echo "Current date server : "; echo date('Y/m/d H:i:s', $today->getTimestamp()); echo "\n";

 $ts=1392381052; //in minute - get by javascript
 $offsetClient=18000; //in seconde - get by javascript
 $offset=$offsetClient+$offsetServer; //in second

 $modifiedServer=$today;
 $modifiedServer=$modifiedServer->setTimestamp($ts);
 echo "Modified date server : "; echo date('Y/m/d H:i:s', $modifiedServer->getTimestamp()); echo "\n";
 $modifiedClient=$today;
 $modifiedClient->setTimestamp($ts-$offset);
 echo "Modified date client : "; echo date('Y/m/d H:i:s', $modifiedClient->getTimestamp()); echo "\n";

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