VTIMEZONE missing STANDARD or DAYLIGHT

[leifnel]

My garbage collection company issues a calender for pickup dates, I want to import into HomeAssistant, but it reports an error.

https://icalendar.org/validator.html reports this

Errors
At least one STANDARD or DAYLIGHT property must be defined here [near line # 4]
Reference: RFC 5545 3.6.5. Time Zone Component

The calendar starts like this

BEGIN:VCALENDAR
PRODID:-//github.com/rianjs/ical.net//NONSGML ical.net 4.0//EN
VERSION:2.0
BEGIN:VTIMEZONE
TZID:Europe/Copenhagen
X-LIC-LOCATION:Europe/Copenhagen
END:VTIMEZONE

Is this an user error or a bug?
If the latter, is it fixed in the latest version?
What should I tell the company?

I can see this is not the main fork, but it redirects here.

[leifnel]

Appearently the VTIMEZONE should look like this for me:

BEGIN:VTIMEZONE
TZID:Europe/Copenhagen
X-LIC-LOCATION:Europe/Copenhagen
BEGIN:STANDARD
DTSTART:19701025T030000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:19700329T020000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
END:DAYLIGHT
END:VTIMEZONE

[axunonb]

That's correct. If there is a VTZIMEZONE it must look like that.

The timezone may be omitted. Then, the times in your calendar will be interpreted as floating times, which means they will not be tied to any specific timezone. This can lead to issues with time accuracy, especially if the calendar is used across different time zones.