$(document).ready(function() {
   if($('.time_display').size() > 0) {
      renewTime();
   }
});

function timeToString(dateStr) {
   var pos = dateStr.indexOf('GMT');
   if(pos != -1) {
      dateStr = dateStr.substring(0, pos);
   }
   pos = dateStr.lastIndexOf(':');
   if(pos != -1) {
      dateStr = dateStr.substring(0, pos);
   }
   return dateStr;
}

function renewTime() {
   $('.time_display').each(function() {
      var offset = $(this).text();
      var dateTime = new Date();
      var offsetMs = dateTime.getTime() + offset * 60 * 60 * 1000;
      dateTime = new Date(offsetMs);
      var dateStr = timeToString(dateTime.toUTCString());
      $(this).html('<i>' + dateStr + '</i>');
      $(this).css('display', 'block');
   });
//   setInterval("renewTime();", 1000 * 60);
}