This scrapes the HTML on Hal Higdon's training pages, with a race date, and exports a .ics file to import the workouts into Google Calendar, iCal, etc.

hal-higdon-export.js

(function () {
	function hashCode (string){
	    var hash = 0;
	    if (string.length == 0) return hash;
	    for (i = 0; i < string.length; i++) {
	        char = string.charCodeAt(i);
	        hash = ((hash<<5)-hash)+char;
	        hash = hash & hash; // Convert to 32bit integer
	    }
	    return hash;
	}


	var training = document.querySelectorAll('.training-schedule #miles tr td');

	var items = Array.from(training).filter(function (item, index) {
		return index % 8 !== 0;
	}).map(function (item) {
		return item.textContent;
	});

	var marathonDate = new Date(prompt('Marathon date? (assumes Sunday)'));

	var finalEvents = Array.from(items).reverse().map(function (item) {

		var month = (marathonDate.getMonth() + 1);
		if (month < 10) {
			month = '0' + month;
		}
		var date = (marathonDate.getDate() + 1);
		if (date < 10) {
			date = '0' + date;
		}
		var toReturn = {
			text: item,
			date: marathonDate.getFullYear() + '-' + month + '-' + date
		};
		marathonDate.setDate(marathonDate.getDate() - 1);
		return toReturn;
	}).reverse().map(function (object) {
return `BEGIN:VEVENT
UID:${hashCode(JSON.stringify(object))}
ORGANIZER;CN=Josh Kramer:MAILTO:jkjustjoshing@gmail.com
DTSTART:${object.date.replace(/-/g, '')}
DTEND:${object.date.replace(/-/g, '')}
SUMMARY:${object.text}
END:VEVENT`;

	});


var vcal = `BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//hacksw/handcal//NONSGML v1.0//EN
${finalEvents.join(`\n`)}
END:VCALENDAR`;

	var link = document.createElement('a');
	link.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(vcal));
	link.setAttribute('download', 'trainingPlan.ics');
	link.setAttribute('style', 'font-size: 30px; color: red;');
	link.appendChild(document.createTextNode('Download Training Plan'));

	document.body.appendChild(link);

	return link;
})()