How do I sort a rowset with Server Side Javascript linked with AmpScript?

I'm using AmpScript to make a custom email and I need to sort rows to display them in order of date. I saw that I can use Server Side Javascript to make this, but my variable in ampscript is a rowset, I don't know how to manipulate this kind of var in SSJS.

I've already seen this post but it doesn't work with rowset

Code : I retrieve my objects like this in ampscript

SET @sessions = RetrieveSalesforceObjects("EventApi__Schedule_Item__c", "id,Name,EventApi__Start_Time__c,EventApi__End_Time__c,MCRoomName__c,EventApi__Start_Date__c,EventApi__Event__c", "EventApi__Event__c","=",@eventId, "EventApi__Is_Active__c","=","TRUE", "FormatType__c","=","Workshop")
SET @nbsessions = rowcount(@sessions)

and I want to use it in this to sort them with a SSJS, for now I've done this but it doesn't work :

<script runat="server">
Platform.Load("Core","1");
var workshop=Variable.GetValue("@sessions");
var nbworkshop=Variable.GetValue("@nbsessions");
var rows =[];
for(i=0;i<nbworkshop;i++){
  rows.push(workshop[i]);
}
Write(Stringify(workshop));
Variable.SetValue("@debug", Stringify(nbworkshop));
Variable.SetValue("@debug", Stringify(rows));
</script>
%%=v(@debug)=%%

Example of what I retrieve in @sessions for AMPScript :

%%[
FOR @i = 1 to @nbsessions do VAR @sessionName,@date,@startTime,@endTime,@place,@sessionId 
SET @row =row(@sessions,@i) 
SET @sessionName = field(@row, "Name") 
SET @date = field(@row,"EventApi__Start_Date__c") 
SET @startTime = field(@row, "EventApi__Start_Time__c") 
SET @endTime = field(@row, "EventApi__End_Time__c") 
SET @place = field(@row, "MCRoomName__c") 
SET @eventSession= field(@row, "EventApi__Event__c") 
SET @sessionId = field(@row,"id")
]%%

%%=v(@date)=%% - %%=v(@startTime)=%% - %%=v(@endTime)=%%
 %%=v(@sessionName)=%%
o The Workshop will take place in %%=v(@place)=%%
o Topics covered : %%[
VAR @topics,@nbtopics,@rowtopic SET @topics = RetrieveSalesforceObjects("EventApi__Track_Schedule_Item__c","MCTagName__c","EventApi__Schedule_Item__c","=",@sessionId) SET @nbtopics = rowcount(@topics)

FOR @j=1 to @nbtopics do VAR @topicname SET @rowtopic = row(@topics,@j) SET @topicname = field(@rowtopic,"MCTagName__c")
]%% %%[IF @j == @nbtopics THEN]%%%%=v(@topicname)=%%%%[ELSE]%%%%=v(@topicname)=%%, %%[ENDIF]%%%%[NEXT @j]%%
%%[NEXT @i]%%

And it is like this but I would like to order them thanks to SSJS in order of date and startTime if possible:

2018-09-13 - 6:00 PM - 7:00 PM
 Gender Equality : More to Do!
o The Workshop will take place in OECD
o Topics covered :  Smart cities & mobility,  Climate


2018-09-13 - 3:30 PM - 5:00 PM
 New ways to live in Global Cities
o The Workshop will take place in OECD
o Topics covered :  Smart cities & mobility,  Climate


2018-09-12 - 4:30 PM - 6:00 PM
 Disruptive innovation in mobility: Implications for our urban public transports
o The Workshop will take place in OECD
o Topics covered :  Smart cities & mobility,  Climate

Do you have any idea how to achieve this ? thanks