Start-/Endtime wrong (+1 hour) since time change in march

Bug Report

Actually there seem to be a time difference since time change in march. iCal sets wrong time in calendartools. Our students are reporting events with +1 hour.

On iPhone and Mac calendar...everything is fine. Problems seems to be on Windows + Outlook

Edit: Also Android has correct times.

Example: Event from 19:15 to 22:15

Calendar: Windows + Outlook

ical file
BEGIN:VCALENDAR
PRODID:-//eluceo/ical//2.0/EN
VERSION:2.0
CALSCALE:GREGORIAN
BEGIN:VEVENT
UID:28e314e2a1271edd30c21924333fba77
DTSTAMP:20220412T091732Z
SUMMARY:Federwild Teil 1 (M-2203)
DESCRIPTION:
URL:xxxx/intern/termin/federwild- teil-1-m-2203-19-04-2022-9259.html
DTSTART;TZID=Europe/Berlin:20220419T191500
DTEND;TZID=Europe/Berlin:20220419T221500
LOCATION:Onlineseminar
END:VEVENT
END:VCALENDAR

Data in iCal fine looks fine for me!? But why the times are set wrong since time change?

On Wikipedia iCal i see an additional letter after time ('Z' zulu suffix)
https://de.wikipedia.org/wiki/ICalendar

TZID=Europe/Berlin:20200910T220000Z

Maybe this is the problem?
Edit: with "Z" its +2h

Or its the missing timezone

  BEGIN:VTIMEZONE
    TZID:Europe/Berlin
    BEGIN:STANDARD
      DTSTART:16011028T030000
      RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
      TZOFFSETFROM:+0200
      TZOFFSETTO:+0100
    END:STANDARD
    BEGIN:DAYLIGHT
      DTSTART:16010325T020000
      RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
      TZOFFSETFROM:+0100
      TZOFFSETTO:+0200
    END:DAYLIGHT
  END:VTIMEZONE

Maybe i found a solution:
https://stackoverflow.com/questions/27711246/recurring-calender-invitation-was-showing-one-hour-off-after-dst-starts

https://stackoverflow.com/questions/14196867/outlook-shows-wrong-time-from-ical

We had this problem in #9 already (sorry for double post)

Does it fix the issue on Windows (and not affect the others), if you add Z to the time string?
I don't have Windows & Outlook here to test, sorry.

Nope. I mentioned this in „edit“ above.

With Z it’s +2 😁. I will try it on Mac later.

Ok. I don't know how I can help with Outlook related issues if it works on all other systems.

From stackoverflow.com/questions/27711246/recurring-calender-invitation-was-showing-one-hour-off-after-dst-starts:

If you want an event to be in a time zone, you should specify the local time instead of a UTC time (so no Z at the end) and a TZID property to specify the time zone. I suggest you export some of your existing events as ical entries to see what those look like.

Therefore, the .ics file looks correct.

How does the file look like, if you create one in Outlook and export it?

What happens if you add the TZID entry to the .ics file: TZID:Europe/Berlin?

Mac: When i add Z to the timestamp on Mac i see GMT in Event.

Without Z

Even if i add the TZIP separately


TZID:Europe/Berlin
DTSTART;TZID=Europe/Berlin:20220419T191500Z
DTEND;TZID=Europe/Berlin:20220419T221500Z

Windows + Outlook
Adding Z makes it + 2. Event with seeting timezone separately

TZID:Europe/Berlin
DTSTART;TZID=Europe/Berlin:20220419T191500Z
DTEND;TZID=Europe/Berlin:20220419T221500Z

Event created from Windows + Outlook

BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 16.0 MIMEDIR//EN
VERSION:2.0
METHOD:PUBLISH
X-MS-OLK-FORCEINSPECTOROPEN:TRUE
BEGIN:VTIMEZONE
TZID:W. Europe Standard Time
BEGIN:STANDARD
DTSTART:16011028T030000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:16010325T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
CLASS:PUBLIC
CREATED:20220413T063701Z
DESCRIPTION: \n
DTEND;TZID="W. Europe Standard Time":20220413T221500
DTSTAMP:20220413T063701Z
DTSTART;TZID="W. Europe Standard Time":20220413T191500
LAST-MODIFIED:20220413T063701Z
LOCATION:Onlineseminar
PRIORITY:5
SEQUENCE:0
SUMMARY;LANGUAGE=de:Testevent
TRANSP:OPAQUE
UID:040000008200E00074C5B7101A82E0080000000020C328A5114FD801000000000000000
	0100000004DB6A10CC675514EA76817275F61A2D5
X-MICROSOFT-CDO-BUSYSTATUS:BUSY
X-MICROSOFT-CDO-IMPORTANCE:1
X-MICROSOFT-DISALLOW-COUNTER:FALSE
X-MS-OLK-AUTOFILLLOCATION:FALSE
X-MS-OLK-CONFTYPE:0
END:VEVENT
END:VCALENDAR

Importing the .ics file which i created in windows on mac, every setting is fine. Microsoft has names time zone "W. Europe Standard Time". I think this could be the difference.

I tried this in the original ical file and it is fine.

BEGIN:VCALENDAR
PRODID:-//eluceo/ical//2.0/EN
VERSION:2.0
CALSCALE:GREGORIAN
BEGIN:VEVENT
UID:867290d39ace54401ec2313cf8e07cfe
DTSTAMP:20220413T063140Z
SUMMARY:Federwild Timezone W. Europe Standard Time (M-2203)
DESCRIPTION:
URL:https://www.jagdbildungszentrum.de/intern/termin/federwild-teil-1-m-220
 3-19-04-2022-9259.html
DTSTART;TZID=W. Europe Standard Time:20220419T191500
DTEND;TZID=W. Europe Standard Time:20220419T221500
LOCATION:Onlineseminar
END:VEVENT
END:VCALENDAR

The W. Europe Standard Time timezone looks totally weird to me. It is a Microsoft creation actually: rlanvin/php-rrule#69

Sadly a combination does not work

TZID:W. Europe Standard Time
DTSTART;TZID=Europe/Berlin:20220419T191500
DTEND;TZID=Europe/Berlin:20220419T221500

or

DTSTART;TZID=Europe/Berlin:20220419T191500
DTEND;TZID=Europe/Berlin:20220419T221500
DTSTART;TZID=W. Europe Standard Time:20220419T191500
DTEND;TZID=W. Europe Standard Time:20220419T221500

Problem here, this this timezone is not in the official list of PHP's timezones: https://www.php.net/manual/en/timezones.php

And just generating .ics files with these Windows timezones mentioned above seems totally wrong to me. Do you even need timezones? Or would it help to have an option to disable the timezones? If we omit the TZ data explicitly (on configured option), it may work?

I don´t need timezones but don´t we get the problem from #9 without them?

Hmm, it possibly works then on Windows but not anymore on Apple devices 🙈

Funfact....using "W. Europe Standard Time" works on Mac, Windows, Android :-D

But what happens with the other windows timezones?

.ics activating timezone created in Outlook

BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 16.0 MIMEDIR//EN
VERSION:2.0
METHOD:PUBLISH
X-MS-OLK-FORCEINSPECTOROPEN:TRUE
BEGIN:VTIMEZONE
TZID:W. Europe Standard Time
BEGIN:STANDARD
DTSTART:16011028T030000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:16010325T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
CLASS:PUBLIC
CREATED:20220413T071553Z
DTEND;TZID="W. Europe Standard Time":20220419T221500
DTSTAMP:20220413T063140Z
DTSTART;TZID="W. Europe Standard Time":20220419T191500
LAST-MODIFIED:20220413T071553Z
LOCATION:Onlineseminar
PRIORITY:5
SEQUENCE:0
SUMMARY;LANGUAGE=de:Federwild Timezone test (M-2203)
TRANSP:OPAQUE
UID:867290d39ace54401ec2313cf8e07cfe
X-MICROSOFT-CDO-BUSYSTATUS:BUSY
X-MICROSOFT-CDO-IMPORTANCE:1
END:VEVENT
END:VCALENDAR

Maybe use UTC in genereal? This is "koordinierte Weltzeit" but maybe we run into #9


BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 16.0 MIMEDIR//EN
VERSION:2.0
METHOD:PUBLISH
X-MS-OLK-FORCEINSPECTOROPEN:TRUE
BEGIN:VTIMEZONE
TZID:UTC
BEGIN:STANDARD
DTSTART:16010101T000000
TZOFFSETFROM:-0000
TZOFFSETTO:-0000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
CLASS:PUBLIC
CREATED:20220413T071810Z
DTEND;TZID=UTC:20220419T221500
DTSTAMP:20220413T063140Z
DTSTART;TZID=UTC:20220419T191500
LAST-MODIFIED:20220413T071810Z
LOCATION:Onlineseminar
PRIORITY:5
SEQUENCE:0
SUMMARY;LANGUAGE=de:Federwild Timezone test (M-2203)
TRANSP:OPAQUE
UID:867290d39ace54401ec2313cf8e07cfe
X-MICROSOFT-CDO-BUSYSTATUS:BUSY
X-MICROSOFT-CDO-IMPORTANCE:1
END:VEVENT
END:VCALENDAR

Would be a possibility. What happens if you import the UTC one on Apple and android systems?

UTC is fine on Windows, Apple but not on Android. Argh!!!! Why is this such a mess!


BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 16.0 MIMEDIR//EN
VERSION:2.0
METHOD:PUBLISH
X-MS-OLK-FORCEINSPECTOROPEN:TRUE
BEGIN:VTIMEZONE
TZID:UTC
BEGIN:STANDARD
DTSTART:16010101T000000
TZOFFSETFROM:-0000
TZOFFSETTO:-0000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
CLASS:PUBLIC
CREATED:20220413T074356Z
DTEND;TZID=UTC:20220418T221500
DTSTAMP:20220413T063140Z
DTSTART;TZID=UTC:20220418T191500
LAST-MODIFIED:20220413T074356Z
LOCATION:Onlineseminar
PRIORITY:5
SEQUENCE:0
SUMMARY;LANGUAGE=de:UTC test
TRANSP:OPAQUE
UID:867290d39ace54401ec2313cf8e07cfe
X-MICROSOFT-CDO-BUSYSTATUS:BUSY
X-MICROSOFT-CDO-IMPORTANCE:1
END:VEVENT
END:VCALENDAR

Apple

Android

I probably found a solution which is working on all devices. Waiting for android confirmation (confirmed).

It seems to be a solution to set timezone block separately and removing it from DTSTART/DTEND itself.

Snipped VTIMEZONE

BEGIN:VTIMEZONE
TZID:Europe/Berlin
BEGIN:STANDARD
DTSTART:16011028T030000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:16010325T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
END:DAYLIGHT
END:VTIMEZONE

Complete ICS

BEGIN:VCALENDAR
PRODID:-//eluceo/ical//2.0/EN
VERSION:2.0
CALSCALE:GREGORIAN
BEGIN:VTIMEZONE
TZID:Europe/Berlin
BEGIN:STANDARD
DTSTART:16011028T030000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:16010325T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
UID:388da7b9f948e885edf4dff51a7b4891
DTSTAMP:20220413T062556Z
SUMMARY:Federwild Teil 1 (M-2203)
DESCRIPTION:
URL:xxx.de/intern/termin/federwild- teil-1-m-2203-19-04-2022-9259.html
DTSTART:20220419T191500
DTEND:20220419T221500
LOCATION:Onlineseminar
END:VEVENT
END:VCALENDAR

After importing this ical in outlook, timezone is activated and time/timezone is set correctly

OK, Android also confirmed successful :-D

I did a small edit in my last post.

Any updates here? Sorry for bumping. We had to disable this function meanwhile for all of our students.

Not yet as of current workload 😞

Let me know via PM if a sponsoring would help ;-)

I can't buy more time with any money atm 😬

But i try to have a look next week or at the Contao Camp 😎

Thanks! :)

Can you test the branch fix/timezone?

what do i have to set in my composer json?

dev-fix/timezone :)

iCal Files are super long now (800+ lines). Is that intentional? The example above just had the timezone nodes seperate. Actually there a many lines for LMT, CET and CEST.

Also there is a linebreak in the url!?, but URL is working.

BEGIN:VCALENDAR
PRODID:-//eluceo/ical//2.0/EN
VERSION:2.0
CALSCALE:GREGORIAN
BEGIN:VEVENT
UID:8fe0742edd0ecedb72fe9effa5be6b0d
DTSTAMP:20220505T144953Z
SUMMARY:Jagdrecht Teil 1 (M-2201)
DESCRIPTION:
URL:https://dev.xxx.de/preview.php/intern/termin/jagdrecht-
 teil-1-m-2201-19-05-2022-9169.html
DTSTART:20220519T191500
DTEND:20220519T221500
LOCATION:Onlineseminar
END:VEVENT
BEGIN:VTIMEZONE
TZID:Europe/Berlin
BEGIN:STANDARD
DTSTART:00000101T120000
TZNAME:LMT
TZOFFSETTO:+0053
TZOFFSETFROM:+0053
END:STANDARD
BEGIN:STANDARD
DTSTART:18930401T000632
TZNAME:CET
TZOFFSETTO:+0100
TZOFFSETFROM:+0053
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:19160501T000000
TZNAME:CEST
TZOFFSETTO:+0200
TZOFFSETFROM:+0100
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:19161001T000000
TZNAME:CET
TZOFFSETTO:+0100
TZOFFSETFROM:+0200
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:19170416T030000
TZNAME:CEST
TZOFFSETTO:+0200
TZOFFSETFROM:+0100
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:19170917T020000
TZNAME:CET
TZOFFSETTO:+0100
TZOFFSETFROM:+0200
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:19180415T030000
TZNAME:CEST
TZOFFSETTO:+0200
TZOFFSETFROM:+0100
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:19180916T020000
TZNAME:CET
TZOFFSETTO:+0100
TZOFFSETFROM:+0200
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:19400401T030000
TZNAME:CEST
TZOFFSETTO:+0200
TZOFFSETFROM:+0100
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:19421102T020000
TZNAME:CET
TZOFFSETTO:+0100
TZOFFSETFROM:+0200
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:19430329T030000
TZNAME:CEST
TZOFFSETTO:+0200
TZOFFSETFROM:+0100
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:19431004T020000
TZNAME:CET
TZOFFSETTO:+0100
TZOFFSETFROM:+0200
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:19440403T030000
TZNAME:CEST
TZOFFSETTO:+0200
TZOFFSETFROM:+0100
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:19441002T020000
TZNAME:CET
TZOFFSETTO:+0100
TZOFFSETFROM:+0200
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:19450402T030000
TZNAME:CEST
TZOFFSETTO:+0200
TZOFFSETFROM:+0100
END:DAYLIGHT
BEGIN:DAYLIGHT
DTSTART:19450524T030000
TZNAME:CEMT
TZOFFSETTO:+0300
TZOFFSETFROM:+0200
END:DAYLIGHT
BEGIN:DAYLIGHT
DTSTART:19450924T020000
TZNAME:CEST
TZOFFSETTO:+0200
TZOFFSETFROM:+0300
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:19451118T020000
TZNAME:CET
TZOFFSETTO:+0100
TZOFFSETFROM:+0200
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:19460414T030000
TZNAME:CEST
TZOFFSETTO:+0200
TZOFFSETFROM:+0100
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:19461007T020000
TZNAME:CET
TZOFFSETTO:+0100
TZOFFSETFROM:+0200
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:19470406T040000
TZNAME:CEST
TZOFFSETTO:+0200
TZOFFSETFROM:+0100
END:DAYLIGHT
BEGIN:DAYLIGHT
DTSTART:19470511T040000
TZNAME:CEMT
TZOFFSETTO:+0300
TZOFFSETFROM:+0200
END:DAYLIGHT
BEGIN:DAYLIGHT
DTSTART:19470629T020000
TZNAME:CEST
TZOFFSETTO:+0200
TZOFFSETFROM:+0300
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:19471005T020000
TZNAME:CET
TZOFFSETTO:+0100
TZOFFSETFROM:+0200
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:19480418T030000
TZNAME:CEST
TZOFFSETTO:+0200
TZOFFSETFROM:+0100
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:19481003T020000
TZNAME:CET
TZOFFSETTO:+0100
TZOFFSETFROM:+0200
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:19490410T030000
TZNAME:CEST
TZOFFSETTO:+0200
TZOFFSETFROM:+0100
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:19491002T020000
TZNAME:CET
TZOFFSETTO:+0100
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DTSTART:19800406T030000
TZNAME:CEST
TZOFFSETTO:+0200
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BEGIN:STANDARD
DTSTART:19800928T020000
TZNAME:CET
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DTSTART:19810329T030000
TZNAME:CEST
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BEGIN:STANDARD
DTSTART:19810927T020000
TZNAME:CET
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DTSTART:19820328T030000
TZNAME:CEST
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DTSTART:19820926T020000
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TZNAME:CEST
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DTSTART:19850331T030000
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DTSTART:19850929T020000
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END:VTIMEZONE
END:VCALENDAR

Hmm weird. I've added the timezone information to the calendar file rather than to the time entries (according to https://ical.poerschke.nrw/docs/component-calendar#adding-time-zones)

Can you run a composer update and try again? :)

Actually the file is looking good so far. Less lines...26 left :-D. But still CEST included? I don´t mind as long as its working for us.

Actually eveything is correct in:
Mac + Calendar
Windows + Outlook
Android + Calendar
iPhone + Outlook

👍

BEGIN:VCALENDAR
PRODID:-//eluceo/ical//2.0/EN
VERSION:2.0
CALSCALE:GREGORIAN
BEGIN:VEVENT
UID:82fc37a93d6f2710fbd145134d229a7b
DTSTAMP:20220506T063407Z
SUMMARY:Jagdrecht Teil 1 (M-2201)
DESCRIPTION:
URL:https://dev.xxx.de/preview.php/intern/termin/jagdrecht-
 teil-1-m-2201-19-05-2022-9169.html
DTSTART:20220519T191500
DTEND:20220519T221500
LOCATION:Onlineseminar
END:VEVENT
BEGIN:VTIMEZONE
TZID:Europe/Berlin
BEGIN:DAYLIGHT
DTSTART:20220519T191500
TZNAME:CEST
TZOFFSETTO:+0200
TZOFFSETFROM:+0200
END:DAYLIGHT
END:VTIMEZONE
END:VCALENDAR

Dunno where the linebreak in url comes from.

By the way...which field is set into "DESCRIPTION:" value? Event teaser is ignored but would be the correct element (imho)?

It should be the event teaser for description and event title for the title.

It is even tested:

contao-ical-export/tests/Calendar/CalendarCreatorTest.php

Lines 45 to 54 in dbd2bb4

    
           $this->assertSame('Test Event', $event->summary); 
        
           $this->assertSame($startTime, $event->dtstart); 
        
           $this->assertSame($endTime, $event->dtend); 
        
           $this->assertSame((string) new DateTimeValue(new Timestamp($now)), $event->dtstamp); 
        
           $this->assertSame($startTime, $event->dtstart_tz); 
        
           $this->assertSame($endTime, $event->dtend_tz); 
        
           $this->assertSame('Test Event Description', $event->description); 
        
           $this->assertSame('Fadenstrasse 20, 6020 Emmenbrücke', $event->location); 
        
           $this->assertSame('https://domain.com/foo/bar?page=1', $event->url); 
        
           $this->assertSame($timezone, $ical->calendarTimeZone());

What does your title look like?

CEST is just the TZNAME of the TZID:Europe/Berlin i think :)

I made a separat issue to don´t mix things up here #16

Timezone is fine for me. Thank you very much!

Released 2.1.2.

	$this->assertSame('Test Event', $event->summary);
	$this->assertSame($startTime, $event->dtstart);
	$this->assertSame($endTime, $event->dtend);
	$this->assertSame((string) new DateTimeValue(new Timestamp($now)), $event->dtstamp);
	$this->assertSame($startTime, $event->dtstart_tz);
	$this->assertSame($endTime, $event->dtend_tz);
	$this->assertSame('Test Event Description', $event->description);
	$this->assertSame('Fadenstrasse 20, 6020 Emmenbrücke', $event->location);
	$this->assertSame('https://domain.com/foo/bar?page=1', $event->url);
	$this->assertSame($timezone, $ical->calendarTimeZone());