Hi,
I realise this is a very late reply, but I have just solved this problem. If you take whichever object you have assigned to be your leader (summary in this case), you can define a selection based on date.
In my project I am creating an object (I have a custom template called CustomData, but should work the same for timeSeries)
var t = new envision.templates.CustomData(options)
one of the object variables is summary, set be be the leader element. You can make a change to the selection by calling:
t.summary.node.graph.selection.setSelection(area);
where
area = {
x1: startTimeMillis,
x2: endTimeMillis,
y1: 0,
y2: 0,
xfirst: startTimeMillis,
xsecond: endTimeMillis,
yfirst: 0,
ysecond: 0
}
and startTimeMillis and endTimeMillis are the time in milliseconds since epoch ( the time you get from calling new Date().getTime() ).
Hope this helps