Calendar: Events with CREATED:00001231T000000Z are not imported

Created on 26 Apr 2020 · 1Comment · Source: nextcloud/calendar

Exporting several calendar .ics files from Google Calender resulted in several events not being imported when loading them into Nextcloud Calendar. All of them had the following problem where somehow Google didn't have/export a CREATED date for an event and thus defaults it to CREATED:00001231T000000Z (Searching for that value shows other people running into this problem as well).

Steps to reproduce

Import an .ics with one or more events containing CREATED:00001231T000000Z, e.g. the event below:

BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20110104T100000
DTEND;TZID=Europe/Amsterdam:20110104T170000
RRULE:FREQ=WEEKLY;UNTIL=20110126T090000Z;BYDAY=MO,TU,WE,TH,FR
DTSTAMP:20200421T145117Z
UID:[email protected]
CREATED:00001231T000000Z
DESCRIPTION:
LAST-MODIFIED:20110124T101158Z
LOCATION:
SEQUENCE:4
STATUS:CONFIRMED
SUMMARY:test summary text
TRANSP:OPAQUE
END:VEVENT

Expected behaviour

Import events with faulty CREATED fields and set the CREATED date to some default

Actual behaviour

Events with faulty CREATED fields aren't imported

Calendar app

Calendar app version: 2.0.3

Client configuration

Browser: Firefox 75.0

Operating system: Ubuntu 18.04

Server configuration

Operating system: Ubuntu 18/04

Web server: Nginx

Database: PostgreSQL

PHP version: 7.3.17

Nextcloud Version: 18.0.4

Updated from an older installed version or fresh install: Updated from 17

Logs

Log file (data/nextcloud.log)

I think the following part is most relevant, let me know if more logs are needed.

{
  "reqId": "***",
  "level": 4,
  "time": "2020-04-25T22:31:49+00:00",
  "remoteAddr": "***",
  "user": "***",
  "app": "webdav",
  "method": "PUT",
  "url": "/remote.php/dav/calendars/***/***/1BA302CB-7A57-400B-A09E-8DCCEC4AC391.ics",
  "message": {
    "Exception": "Sabre\\DAV\\Exception\\UnsupportedMediaType",
    "Message": "Validation error in iCalendar: The supplied value (0-12-31T00:00:00Z) is not a correct DATE-TIME",
    "Code": 0,
  ...
}

0. to triage bug

Source