bug#56125: 28.1; Timezone conversion sometimes wrong for recurring events, when importing ical to diary

[Martin Apel via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

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Hallo Lars,


Lars Ingebrigtsen <larsi@gnus.org> writes:

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> Martin Apel <martin.apel@3ds.com> writes:
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>> Maybe this is a more general problem, that the diary does not consider
>> timezones at all. I think, that the conversion functionality would
>> need to convert each date of a recurring event separately, as the
>> daylight savings time might have changed between consecutive
>> repetitions.
>
> Yes, for repeating events, diary has to keep track of what the original
> time zone (and time) is, and convert from that time each day.  I've
> skimmed the diary functions, and it doesn't seem like that's something
> the diary functions have taken into accound, so patches welcome.

I suppose, that it would be a major undertaking to teach the diary about timezones. As this is a personal diary it
probably also doesn't make too much sense. Therefore I wonder, if it wouldn't be the better approach, to split a
recurring event from ical into separate events in the diary. This way the conversion functionality could convert each
event separately. When I find the time, I can try to improve this, but for now I don't fully understand the details of
the code.
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