Custom YTD Option in HighStock Range Selector - highcharts

Question

Using the Highstock charting library, Is there any way using the Highstock Range selector to display a custom YTD option?
Current when you use a type of 'ytd' in the range selector, it defaults to using the calendar year. For my use case (and i would have thought for financial institutions as well) i need to display data running from 1st April - 31st March as a 'ytd' option

Answer 1

It's probably not possible without hacking sources, find in Highstock:
else if (type === 'ytd') {
now = new Date(dataMax);
year = now.getFullYear();
newMin = rangeMin = mathMax(dataMin || 0, Date.UTC(year, 0, 1));
now = now.getTime();
newMax = mathMin(dataMax || now, now);
}
So as you can see, dates are hardcoded. You can change them to needed.

Answer 2

Here's how i've done it. Doesn't cope with looking at a previous Financial YTD (Which is a common use case for what i need it for), but i'm sure i could hack something up to do it.
JSFiddle here
$(function() {
var startDate = new Date("April 01, 2012 00:00:00");
var today = new Date();
var count = parseInt((today.getTime() - startDate)/(24*3600*1000)) -1;
$.getJSON('http://www.highcharts.com/samples/data/jsonp.php?filename=aapl-c.json&callback=?', function(data) {
// Create the chart
window.chart = new Highcharts.StockChart({
chart : {
renderTo : 'container'
},
rangeSelector : {
selected: 1,
buttonTheme: {
width:100
},
buttons: [{
type: 'ytd',
count: 1,
text: 'Calendar YTD'
},
{
type: 'day',
count: count,
text: 'Financial YTD'
}]
},
title : {
text : 'AAPL Stock Price'
},
series : [{
name : 'AAPL',
data : data,
tooltip: {
valueDecimals: 2
}
}]
} );
});
});