Hello,

We are using EGroupware Calendar API and sending a PUT request with Content-Type: application/json to update an existing event.

However, we get the following error:

 HTTP 500
 {
   "error": 500,
   "message": "date(): Argument #2 ($timestamp) must be of type ?int, EGroupware\\Api\\DateTime given"
 }

Payload:

 {
   "uid": "urn:uuid:eee2a1c5-d9d7-4574-b19b-a06c126d084c",
   "title": "B",
   "start": "2025-03-30T11:00:00+02:00",
   "timeZone": "Europe/Warsaw",
   "duration": "PT11H",
   "participants": [
     {
       "name": "Tuan Nguyen Le",
       "email": "ngletuan94@gmail.com",
       "kind": "individual",
       "roles": {"optional": true},
       "participationStatus": "accepted"
     }
   ]
 }

We also tried using a timestamp for start, e.g. "start": 1743328800, but the same error occurs.

This seems to be an internal bug in the API backend — the start value gets deserialized to EGroupware\Api\DateTime, but then passed directly to date() function, which expects an int.

Can you please confirm and advise on a fix/workaround?

Thanks!

Yes,
When I update the calendar via API with the following response header:

Payload: 
  {
    'uid': 'urn:uuid:eee2a1c5-d9d7-4574-b19b-a06c126d084c', 
    'title': 'C', 
    'start': '2025-03-30T18:00:00+02:00', 
    'timeZone': 'Europe/Warsaw', 
    'duration': 'PT12H', 
    'participants': [
      {
        'name': 'Dev Test', 
        'email': 'dev.test@jesshotel.pl', 
        'kind': 'individual', 
        'roles': 
          {
            'optional': True
          },
        'participationStatus': 'accepted'
      }
    ]
  }

Response Status Code: 500
Response Headers: 
  {
    'server': 'nginx/1.18.0 (Ubuntu)', 
    'date': 'Mon, 31 Mar 2025 08: 30: 49 GMT', 
    'content-type': 
    'application/json; charset=utf-8', 
    'transfer-encoding': 'chunked', 
    'expires': 'Thu, 19 Nov 1981 08: 52: 00 GMT', 
    'cache-control': 'no-store, no-cache, must-revalidate', 
    'pragma': 'no-cache', 
    'x-dav-powered-by': 
    'EGroupware 23.1.011 CalDAV/CardDAV/GroupDAV server', 
    'content-encoding': 'gzip', 
    'vary': 'Accept-Encoding'
  }

Response Content: b'{\n    "error": 500,\n    "message": "date(): Argument #2 ($timestamp) must be of type ?int, EGroupware\\\\Api\\\\DateTime given"\n}'

Failed to update event urn:uuid:eee2a1c5-d9d7-4574-b19b-a06c126d084c on EGroupware: 500 - {
    "error": 500,
    "message": "date(): Argument #2 ($timestamp) must be of type ?int, EGroupware\\Api\\DateTime given"
}