Php-ews: creating contact birthday's event - php

Question

I am trying to add a contact in Exchange, using the php-ews and the following code:
$request = new EWSType_CreateItemType();
$request->SendMeetingInvitations = 'SendToNone';
$contact = new EWSType_ContactItemType();
$contact->GivenName = $updates['name'];
$contact->Surname = $updates['surname'];
if($updates['email'] != ""){
$email = new EWSType_EmailAddressDictionaryEntryType();
$email->Key = new EWSType_EmailAddressKeyType();
$email->Key->_ = EWSType_EmailAddressKeyType::EMAIL_ADDRESS_1;
$email->_ = $updates['email'];
// set the email
$contact->EmailAddresses = new EWSType_EmailAddressDictionaryType();
$contact->EmailAddresses->Entry[] = $email;
}
$contact->CompanyName = $updates['companyname'];
$contact->JobTitle = $updates['jobtitle'];
$contact->Birthday = $updates['birthday'];
$request->Items->Contact[] = $contact;
$response = $this->ews->CreateItem($request);
Where $updates is an array of strings I have as a parameter.
(I skipped the includes, tell me if you need them.)
Now, the contact gets created and everything works, but the birthday event does not get created automatically in my calendar.
So, I would like to know if there's a simple way to have this done, except the obvious (non-elegant) way of creating it manually.
Thank you in advance,
Riccardo

Answer 1

Could solve this using DateTime in the right format as expected in the comments.
$contact->Birthday = (new DateTime($updates['birthday']))->format(DATE_W3C);
https://learn.microsoft.com/en-us/exchange/client-developer/exchange-web-services/time-zones-and-ews-in-exchange
The time zone specified in the value of dateTime elements can take three forms. You can read all the details in XML Schema Part 2: Datatypes Second Edition, but to paraphrase:
Universal Coordinated Time (UTC): Specified by 'Z'. For example, 2014-06-06T19:00:00.000Z
Specific time zone: Specified by '+' or '-' followed by hours and minutes. For example, 2014-06-06T19:00:00.000-08:00
No time zone: Specified by the absence of any time zone. For example, 2014-06-06T19:00:00.000