parse ISO 8601 date string to local time

iso_time_local.js

function parseISO8601(str) {
  // we assume str is a UTC date ending in 'Z'
	var parts = str.split('T'),
	dateParts = parts[0].split('-'),
	timeParts = parts[1].split('Z'),
	timeSubParts = timeParts[0].split(':'),
	timeSecParts = timeSubParts[2].split('.'),
	timeHours = Number(timeSubParts[0]),
	_date = new Date;

	_date.setUTCFullYear(Number(dateParts[0]));
	_date.setUTCMonth(Number(dateParts[1])-1);
	_date.setUTCDate(Number(dateParts[2]));
	_date.setUTCHours(Number(timeHours));
	_date.setUTCMinutes(Number(timeSubParts[1]));
	_date.setUTCSeconds(Number(timeSecParts[0]));
	if (timeSecParts[1]) _date.setUTCMilliseconds(Number(timeSecParts[1]));

	return _date;
}

var d = new Date(parseISO8601("2012-12-31T10:00:00.0Z"));
console.log(d);