sorting dme query

I have this query:

var dmePath = '/servlet/Router/Data/Erp?'
                  + 'PROD=LOGAN'
                  + '&FILE=WFMETSUM'
                  + '&FIELD=WF-RM-ID;END-DATE;END-TIME;TASK;ACTION-TAKEN'   
                  + '&INDEX=WMSSET1'
                  + '&KEY=' + wu
                  + '&OUT=XML'

that I need to sort by END_DATE and END_TIME.

I saw from a previous post that I can add + '&SORTDESC=END-DATE' as the last line. I think that will work, but to also get it to sort by time do I

add another line + '&SOERTDESC=END-TIME'

OR is it something like

+ '&SORTDESC=END-DATE,END-TIME'

I could try several versions until I get it right; but I have to submit a help ticket with Velocity to move the module for each test (so I get about two test per day) - ARRGH!

Thanks for your help, Jeff