d3.time.format doesn't seem to work

Hi,
I have not been able to make the parsing of date to work in PBI. It fails to show. I have tried several formats with the same result. The source data is a date already in PowerBI.

      	var formatDate = d3.time.format('%Y-%m-%d').parse;
      	leftRow[0] = formatDate(d.date);

The content of leftRow[0] is blank.

Thanks!