Facet chart date formating

How do you format a date type facet in a facet chart?

I tried dateForrmatter/displayFormat.

isc.FacetChart.create({
ID: "cumulativeHoursByOp",
title: "Cumulative Hours by Operator",
width:1400,
backgroundColor: "#aeb1aa",
facets: [{
id:"dt",
title: "Date",
type:"date",
dateFormatter:"toEuropeanShortDate"
},{
id: "operatorCode",
title: "Operator"

}],

chartType: "Column",
stacked: true,
valueProperty: "total",
});

I am using

Version v9.1p_2014-06-03/EVAL Deployment (2014-06-03)