When a GetMap request is issued with a time parameter set to a time interval in
which the first value is greater than the second value, no map and no error is
returned. The image properties states that the image cannot be displayed
because it contains error.
Example of such is request:
http://server/cgi-bin/mapserv_43?map=/path/to/time_test/htdocs/wms_time.map&
request=GetMap&Version=1.1.1&LAYERS=time&
Time=2004-01-01%2015:10:00/2004-01-01%2014:10:00
This is how the metadata is set in the map file (WMS server):
METADATA
"DESCRIPTION" "time"
"wms_title" "time"
"wms_timeitem" "TIME"
"wms_timeextent" "2004-01-01/2004-02-01"
"wms_timedefault" "2004-01-01 14:10:00"
END
Found on Fedora Core 2