Updating Google Calendar - Fatal error: Call to undefined function dateTime() - php

Question

I am trying to update Google Calendar using the PHP API. I have successfully been able to create Google Calendar Events and automatically get the ID for the event, but when I try and update the event, I get this error:
PHP Fatal error: Call to undefined function dateTime() in public_html/googleapi/calendarupdate.php on line 45. It is referring to the line:
$event->setStart.dateTime($startdatetime);
Here is my current PHP Code for the error:
<?php
header('Content-type: application/json');
require_once __DIR__ . '/google-api-php-client/src/Google/autoload.php';
$summary = $_POST["summary"];
$location = $_POST["location"];
$description = $_POST["description"];
$startdatetime = $_POST["startdatetime"];
$enddatetime = $_POST["enddatetime"];
$clientemail = $_POST["clientemail"];
$privatekey = $_POST["privatekey"];
$useremail = $_POST["useremail"];
$calendarid = $_POST["calendarid"];
$client_email = $clientemail;
$private_key = file_get_contents($privatekey);
$scopes = array('https://www.googleapis.com/auth/calendar');
$user_to_impersonate = $useremail;
$credentials = new Google_Auth_AssertionCredentials(
$client_email,
$scopes,
$private_key,
'notasecret', // Default P12 password
'http://oauth.net/grant_type/jwt/1.0/bearer', // Default grant type
$user_to_impersonate
);
$client = new Google_Client();
$client->setAssertionCredentials($credentials);
if ($client->getAuth()->isAccessTokenExpired()) {
$client->getAuth()->refreshTokenWithAssertion();
}
$service = new Google_Service_Calendar($client);
$event = $service->events->get($useremail, $calendarid);
$event->setSummary($summary);
$event->setLocation($location);
$event->setStart.dateTime($startdatetime);
$event->setStart.timeZone('America/Los_Angeles');
$event->setEnd.dateTime($enddatetime);
$event->setEnd.timeZone('America/Los_Angeles');
$event->setDescription($description);
$updatedEvent = $service->events->update($useremail, $event->getId(), $event);
echo json_encode($updatedEvent);
My PHP code is based off of Google's API Documentation found here.

Answer 1

Ok, I actually managed to figure it out. I just had to change the line:
$event->setStart.dateTime($startdatetime);
To This:
$event->start->setDateTime($startdatetime);
I do the same general thing for the end datetime, except where it says start, I just put end. Just tested it and it worked perfectly. The site that helped me out can be found here.