D3 function to parse the date not working

In D3 3.5, you could parse just the way you did, setting the time format...

var formatDate = d3.time.format("%d-%b-%y");

...and then using this time format to parse:

d.date = formatDate.parse(d.date);

But, using D3 4.0, you have to parse dates in a different way, using timeParse:

var parseTime = d3.timeParse("%d-%b-%y");

And, then, modifying your accessor function:

function type(d) {
  d.date = parseTime(d.date);
  d.Flux = +d.Flux;
  return d;
}

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