/**
* Converts dateTime from local TZ to UTC
* Returns dateTime in format expected by the Outlook API
*
* @param dateTime $dateTime
* @return dateTime
*/
protected static function encodeDateTime($dateTime)
{
$utcDateTime = $dateTime->setTimeZone(new \DateTimeZone("UTC"));
$dateFormat = "Y-m-d\\TH:i:s\\Z";
return date_format($utcDateTime, $dateFormat);
}