GNU bug report logs - #18710
24.3; icalendar-import-file does not respect daylight savings

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Christophe Troestler <Christophe.Troestler <at> umons.ac.be>
To: <bug-gnu-emacs <at> gnu.org>
Subject: 24.3; icalendar-import-file does not respect daylight savings
Date: Mon, 13 Oct 2014 17:12:26 +0200

[Message part 1 (text/plain, inline)]

Hi,

My daylight savings are

    calendar-daylight-savings-starts-time = 120
    calendar-daylight-savings-ends-time   = 180

but when I convert the attached ICS calendar containing an event with
the following dates:

    DTSTART:20141103T121500Z
    DTEND:20141103T141500Z

with (icalendar-import-file "a.ics" "a"), I get

    3/11/2014 14:15-16:15 ...

Thus the conversion did not use the fact that, at this date, the
winter time (UTC+1) is in use and not UTC+2 (the current time).

Could you please fix this bug?

Thanks,
C.


----------------------------------------------------------------------

In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.12.2)
 of 2014-09-08 on binet, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11601000
System Description:	Debian GNU/Linux testing (jessie)

Configured using:
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 '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
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Important settings:
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  value of $LC_NUMERIC: en_US.UTF-8
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Recent input:
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q u e n <tab> b <tab> <tab> <M-tab> <down> M a t h 
SPC e l e m SPC 5 M-> S A l u t , <return> <up> M-c 
<down> <down> <return> J ' a i SPC m i s SPC m a SPC 
c o r r e c t i o n SPC d u SPC t e s t SPC 5 SPC d 
a n s SPC <backspace> <backspace> s SPC t o n SPC a 
s i e r SPC e t <C-left> <C-left> c <down> SPC l e 
SPC f c h i <backspace> <backspace> <backspace> i c 
h i e r SPC s u r SPC d r o p b v o <backspace> <backspace> 
<backspace> b o x . M-q C-x C-s <return> <return> B 
o n n e SPC f i n SPC d e SPC j o u r n é e , <return> 
c . <backspace> <backspace> C . C-c C-c y p d SPC SPC 
d SPC d n <switch-frame> <help-echo> C-x C-f ~ / . 
e m <tab> i n i <tab> <return> C-s h r a <backspace> 
<backspace> p <backspace> <backspace> h o r a i <next> 
<down-mouse-4> <mouse-4> <double-down-mouse-4> <double-mouse-4> 
<triple-down-mouse-4> <triple-mouse-4> <down-mouse-4> 
<mouse-4> <double-down-mouse-4> <double-mouse-4> <triple-down-mouse-4> 
<triple-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
<down-mouse-4> <mouse-4> <double-down-mouse-4> <double-mouse-4> 
<triple-down-mouse-4> <triple-mouse-4> <triple-down-mouse-4> 
<triple-mouse-4> <down-mouse-1> <mouse-movement> <mouse-1> 
<C-left> C-SPC <C-right> <C-right> <C-right> M-w <switch-frame> 
C-h v C-y <return> C-h v C-y <return> M-x b u g <tab> 
<tab> <M-backspace> <M-backspace> e m a <tab> <down-mouse-1> 
<mouse-movement> <mouse-2> <return> C-g <switch-frame> 
<switch-frame> M-x r e p o <tab> r t ² <backspace> 
<tab> e m <tab> b <tab> <return>

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Features:
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[a.ics (text/calendar, inline)]

BEGIN:VCALENDAR
VERSION:2.0
PRODID;LANGUAGE=fr:Copyright Index-Education - HYPERPLANNING 2014
METHOD:PUBLISH
X-CALSTART:20140915T000000Z
X-CALEND:20150913T000000Z
X-WR-CALNAME;LANGUAGE=fr:HYP - XXX
X-WR-CALDESC;LANGUAGE=fr:XXX
BEGIN:VEVENT
CATEGORIES:HYPERPLANNING
DTSTAMP:20141013T170144Z
LAST-MODIFIED:20141009T141510Z
UID: XXX
DTSTART:20141103T121500Z
DTEND:20141103T141500Z
SUMMARY;LANGUAGE=fr:XXX
LOCATION;LANGUAGE=fr:NiP.0A07
DESCRIPTION;LANGUAGE=fr:XXX
END:VEVENT

Message #8 received at 18710 <at> debbugs.gnu.org (full text, mbox):

From: Ulf Jasper <ulf.jasper <at> web.de>
To: Christophe Troestler <Christophe.Troestler <at> umons.ac.be>,
 18710-done <at> debbugs.gnu.org
Cc: 18710 <at> debbugs.gnu.org
Subject: Re: bug#18710: 24.3;
 icalendar-import-file does not respect daylight savings
Date: Tue, 14 Oct 2014 17:34:00 +0200

Christophe Troestler <Christophe.Troestler <at> umons.ac.be> writes:

> but when I convert the attached ICS calendar containing an event with
> the following dates:
>
>     DTSTART:20141103T121500Z
>     DTEND:20141103T141500Z
>
> with (icalendar-import-file "a.ics" "a"), I get
>
>     3/11/2014 14:15-16:15 ...
>
> Thus the conversion did not use the fact that, at this date, the
> winter time (UTC+1) is in use and not UTC+2 (the current time).

Thanks for reporting.  This is a duplicate of bug #15408 which has been
resolved on trunk.

Closing this bug.


BTW: `calendar-daylight-savings-starts-time' and
`calendar-daylight-savings-ends-time' are not important here.  Rather it
is `calendar-daylight-savings-starts' and
`calendar-daylight-savings-ends'.  But you probably would not need to
touch these either.  Please have a look at the "Daylight Saving Time"
section in the Emacs manual.

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