[Users] claws-mail displays ics file wrongly

[clawsmail at pasdzierny.de]

thanks for replying.

(1) the main thing i found strange about the file is its size: many
confusing lines => many ambiguities => very likely errors ;)

(2) I dont know if "UK time" means summer time. What I do know is that
UTC is *not* summer time, thats where my *2* hours of difference come
from.

(3) the system generating the file is used for years by our gouvernment.
Of course that does *not* mean it's error free. But:  100s of
persons get their appointment ticket every day exactly the way I got
it, I guess that means sth. 

(4) even if I do not like it: an app like the google calendar became
sth like the reference, much more relevant than all RFCs together :|

Final question:
Is claws wanting to be *just right* ?
Or is it trying to serve its users with those real world
problems they have (as google calendar seems capable to do in this case)
?

regards, Martin.

On Wed, 28 Aug 2024 13:35:31 +0000
"David Fletcher" <David at megapico.co.uk> wrote:

> >From: clawsmail at pasdzierny.de
> >hello,
> >
> >I am not an expert in ics files, but the attached ics file should
> >refer to 10h CEST (and it does so when imported into google calendar)
> >but I get 12h displayed using claws-mail (version 4.3.0 )(HTML was
> >turned off), see attached screenshot as pdf
> >
> >Because of the difference of 2h is the same as the difference from
> >CEST to UTC my guess is that the timezone is considered falsely or
> >not at all.
> >
> >cheers, Martin.  
> 
> 
> I think there's something strange about this ICS calendar file.
> 
> Germany is 1 hour ahead of United Kingdom. Opening it in the UK it
> shows a meeting at 11am (UK time) in Claws, so that is two hours the
> wrong way. If I open it using the Apple calendar it shows a meeting
> at 10am (UK time), so that is one hour wrong.
> 
> If it's meant to be 10am CEST there's something wrong with the ICS
> file as it should show 9am (UK), not 10 or 11. Central European
> Summer Time is 1 hour ahead of United Kingdom.
> 
> Looking inside the file it has 8 different time-zone offset entries as
> pairs of
> 
> TZOFFSETFROM:
> TZOFFSETTO:
> 
> I would guess that wherever this came from has tried to supply
> pre-calculated times for a range of regions, and this over-supply of
> information is confusing not just Claws but also the Apple calendar
> too.
> 
> Looking inside the ICS file shows a product name "Kommunix
> GmbH//iCal4j 1.0//DE". Searching Google for this takes me to a github
> page: https://github.com/ical4j/ical4j/issues
> 
> Looking quickly (not in-depth) at the issues listed there, it has
> multiple complaints about the timezone information for various regions
> being wrong. Maybe this is the issue, not Claws Mail! Maybe the ICS
> file is theoretically correct, but actually too complicated for some
> calendars (including the Apple one) to interpret.
> 
> Best regards, David.
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