code: function updateCurrentTime(catalogItem, updatedTime) {
    if (defined(catalogItem.clock)) {
      catalogItem.clock.currentTime = JulianDate.clone(updatedTime);
    }
  }
docs: Updates the item.clock.currentTime using the value provided.
  This function does this so that all clients subscribed to the items clock with DataSourceClock.definitionChanged are notified.
  
  @param catalogItem The CatalogItem to set the current time for.
  @param updatedTime The new current time to use.
  @private