Does time in GeoServer work?

Question

I'm trying to replicate the time sample founded in the GeoServer User Manual here

http://docs.geoserver.org/latest/en/user/googleearth/tutorials/time/time.html

Here you are my GeoServer status

Version 2.2.3
Git Revision 0fd3212ede1a8e13257ae5785cc8a752ee0a645c
Build Date 22-Dec-2012 15:59
GeoTools Version 8.5 (rev 06286dc3c15c2498aa5b3580de5df928f07d31dc) 

I can see the layer at this url on my local pc

http://......../geoserver/CesareWorkspace/wms?service=WMS&version=1.1.0&request=GetMap&layers=CesareWorkspace:inet_weu&styles=&bbox=-31.290000915527344,27.6374969482422,18.514999389648438,55.056663513183594&width=599&height=330&srs=EPSG:4326&format=application/openlayers

In the user manual for to try the layer in Google Earth I see

"Navigate to http://......./geoserver/wms/kml_reflect?layers=inet_weu&legend=true. This should cause Google Earth to open."

Adapting the url at my sample

http://......./geoserver/CesareWorkspace/wms/kml_reflect?layers=CesareWorkspace:inet_weu&legend=true

the result is

<ServiceExceptionReport version="1.3.0" xsi:schemaLocation="http://www.opengis.net/ogc http://........./geoserver/schemas/wms/1.3.0/exceptions_1_3_0.xsd"><ServiceException code="OperationNotSupported" locator="kml_reflect">
  No such operation CesareWorkspace/wms null kml_reflect

In the same time the follow url

http://......../geoserver/CesareWorkspace/wms/kml?layers=CesareWorkspace:inet_weu

it works. The right one?

In any case, when I try to open the kml in Google Earth i can see the layer on the globe but no time slider is shown....

Any suggestions?

Thank you in advance ...

Cesare