$this->set('date', 'now');
$this->set('dateEnd', 'now + 60 minutes');
$this->set('summary', 'ICS Calendar File');
$this->set('description', '');
$this->set('location', '');
$this->set('url', '');
$this->set('timezone', new \DateTimeZone(date_default_timezone_get()));

// get the module
$icsgen = wire()->modules->IcsGenerator;

// set single properties (date strings)
$icsgen->set('date',    '2033-12-24 12:00');
$icsgen->set('dateEnd', '2033-12-24 14:00');

// set single properties (DateTime)
$icsgen->set('date',    new \DateTime('2033-12-24 12:00'));
$icsgen->set('dateEnd', new \DateTime('2033-12-24 14:00'));

// the set timezone will only impact time strings!
$icsgen->set('timezone', new \DateTimeZone('Europe/Berlin'));
$icsgen->set('date',    'now');
$icsgen->set('dateEnd', 'now + 60 minutes');

// set timezone will be ignored when string is a unix timestamp or contains a timezone
$icsgen->set('date',    '@946684800');
$icsgen->set('date',    '2010-01-28T15:00:00+02:00');

// set timezone will not impact DateTime!
// construct your DateTime with DateTimeZone instead
$icsgen->set('date',    new \DateTime('2033-12-24 12:00', new \DateTimeZone('Asia/Dubai')));
$icsgen->set('dateEnd', new \DateTime('2033-12-24 12:00', new \DateTimeZone('Europe/Paris')));

// set multiple properties at once
$icsgen->setArray(array(
    'date' => '2033-12-24 12:00',
    'dateEnd' => '2033-12-24 14:00',
    'summary' => 'Event Title',
    'description' => 'Event Description',
));

// get ICS string
$str = $icsgen->getString();

// get ICS object
$ics = $icsgen->getICS();

// get path to a temporary .ics file
// using wire()->files->tempDir
$path = $icsgen->getFile();

// get path to a temporary .ics file by ID
// this is useful if you need the same ICS multiple times in one request
// (same file id will only be created once)
$path = $icsgen->getFileByID('christmas-2033');

// example: send email with ics file
$mail = wireMail();
$mail->attachment($path, 'calendar.ics');
$mail->to($user->email);
$mail->subject('ICS Demo');
$mail->body('This is a ICS demo.');
$numSent = $mail->send();