function utcTimeToDate(t) {
	var m = t.match(UTCTIME_RE);
	assert.ok(m, 'timestamps must be in UTC');
	var d = new Date();

	var thisYear = d.getUTCFullYear();
	var century = Math.floor(thisYear / 100) * 100;

	var year = parseInt(m[1], 10);
	if (thisYear % 100 < 50 && year >= 60)
		year += (century - 1);
	else
		year += century;
	d.setUTCFullYear(year, parseInt(m[2], 10) - 1, parseInt(m[3], 10));
	d.setUTCHours(parseInt(m[4], 10), parseInt(m[5], 10));
	if (m[6] && m[6].length > 0)
		d.setUTCSeconds(parseInt(m[6], 10));
	return (d);
}
Get compiled schema from the instance by `key` or `ref`.
@this   Ajv
@param  {String} keyRef `key` that was passed to `addSchema` or full schema reference (`schema.id` or resolved id).
@return {Function} schema validating function (with property `schema`).