code: function(date, h) {
          var copiedDate = new Date(date.getTime());
          copiedDate.setHours(copiedDate.getHours()+h);
          return copiedDate;
      }
docs: Add or subtract hours
  Adding 2 hours
  => myDate.addHours(2)
  Subtracting 10 hours
  => myDate.addHours(-10)