Need to be able to export events to calendar (.ics)

I basically want a php query i can add to my functions php or a plugin (widget)..
I believe you just need to add in the relevant gd fields..
(and a link to trigger this..!)

var todayDate	= new Date();
var msgData	= todayDate.toISOString();
var startDate	= e.start.toISOString();
var endDate	= e.end.toISOString();

var icsMSG1 = "BEGIN:VCALENDARrnVERSION:2.0rnPRODID:https://www.google.com/rnBEGIN:VEVENTrnUID:https://www.google.com/rnDTSTAMP:" + msgData + "ZrnDTSTART:" + startDate + "rn";

var icsMSG2 = '';
if(endDate != '') {
    icsMSG2 = "DTEND:" + endDate +"rn";
}

icsMSG3 = "SUMMARY:" + title + "rnEND:VEVENTrnEND:VCALENDAR";

icsMSG = icsMSG1 + icsMSG2 + icsMSG3;

$('.test-ics').click(function(){
    window.open( "data:text/calendar;charset=utf8," + escape(icsMSG));
});

Let me know how much! thanks 🙂