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Recurrences intermittently getting offset (by 1 hour?)
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Charlie Wood  
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 More options Jan 3 2007, 7:55 am
From: "Charlie Wood" <charlie.w...@gmail.com>
Date: Wed, 03 Jan 2007 04:55:58 -0800
Local: Wed, Jan 3 2007 7:55 am
Subject: Recurrences intermittently getting offset (by 1 hour?)
We've been getting sporadic reports of recurrences being moved by gCal
to a different startTime. This morning I was able to reproduce this,
but only intermittently:

- I created the following entry (using the API with raw HTTP requests):
<entry xmlns='http://www.w3.org/2005/Atom'
xmlns:gd='http://schemas.google.com/g/2005'
xmlns:gCal='http://schemas.google.com/gCal/2005'>
<gd:recurrence>DTSTART;TZID=America/Chicago:20061231T050000
DURATION:PT3600S
RRULE:FREQ=DAILY;INTERVAL=1</gd:recurrence>
- It showed up in gCal as beginning at 0400 local time, not 0500
- I verified that the calendar and my gCal "current timezone" were both
set to America/Chicago

- Then I tried to reproduce the problem using the exact same code, but
with a new startTime (same day, different time). The new event showed
up fine.

- So I ran the same code 10 more times (using a fresh session each
time), each time with an identical recurrence other than the startTime
hour.
- 2 out of 10 recurrences were offset in gCal by -1 hour. The other 8
were fine.

Note that I don't know if the 1-hour offset is a constant, or if it's
based on my timezone. One of our users reporting seeing events that
were set to occur in the MST timezone, even though he's in EST, and all
of his personal and calendar settings are set to EST. However, in each
of my 10 test cases, the calendar in question was listed in the
metafeed as having the same timezone: America/Chicago.

Anyway, this appears to be easily reproducible for me. Please let me
know if I can provide any more detail that will help you guys track
down the problem.

Regards,
Charlie


 
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Ryan Boyd (Google) Google employee  
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 More options Jan 3 2007, 10:08 am
From: "Ryan Boyd (Google)" <api.rb...@google.com>
Date: Wed, 03 Jan 2007 15:08:28 -0000
Local: Wed, Jan 3 2007 10:08 am
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)
Thank you very much Charlie for the report and detailed debugging work.
 Thanks also for the offer to provide more detail --  I have limited
bandwidth right now, but will attempt to recreate the problem shortly
and let you know if there's any issues doing that.

Thanks again!

Cheers,
-Ryan


 
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Charlie Wood  
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 More options Jan 3 2007, 3:00 pm
From: "Charlie Wood" <charlie.w...@gmail.com>
Date: Wed, 03 Jan 2007 12:00:57 -0800
Local: Wed, Jan 3 2007 3:00 pm
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)
Limited bandwidth? I thought Google (and therefore each of its
employees) was omnipotent! Maybe just omniscient... :-)

 
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Ryan Boyd (Google) Google employee  
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 More options Jan 3 2007, 3:55 pm
From: "Ryan Boyd (Google)" <api.rb...@google.com>
Date: Wed, 03 Jan 2007 20:55:40 -0000
Local: Wed, Jan 3 2007 3:55 pm
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)
Hi Charlie,

lol

I tested this out, but wasn't able to recreate it.

I set the timezone of my calendar to Central.
I set the timezone in the UI (settings, general) to Central as well.
I verified that the feed timezone was America/Chicago
I added the event with the following recurrence spec:
recur = "DTSTART;TZID=America/Chicago:20061231T050000" + crlf +
"DURATION:PT3600S" + crlf +
"RRULE:FREQ=DAILY;INTERVAL=1";

The event repeatedly added at 5am on my calendar (10 times), though I
did see the 'Failed to process recurrence rule' error on occassion.

I will try and run it some more times to see if that has any effect.
Can you verify the time zones set on the calendar and in the UI?

Also, what times besides 0500 did you try?  Can you send me (privately
if you wish) the calendar address usern...@domain.tld or
calen...@group.calendar.google.com?

Thanks!

-Ryan


 
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Ryan Boyd (Google) Google employee  
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 More options Jan 3 2007, 3:57 pm
From: "Ryan Boyd (Google)" <api.rb...@google.com>
Date: Wed, 03 Jan 2007 20:57:03 -0000
Local: Wed, Jan 3 2007 3:57 pm
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)
Hi Charlie,

lol

I tested this out, but wasn't able to recreate it.

I set the timezone of my calendar to Central.
I set the timezone in the UI (settings, general) to Central as well.
I verified that the feed timezone was America/Chicago
I added the event with the following recurrence spec:
recur = "DTSTART;TZID=America/Chicago:20061231T050000" + crlf +
"DURATION:PT3600S" + crlf +
"RRULE:FREQ=DAILY;INTERVAL=1";

The event repeatedly added at 5am on my calendar (10 times), though I
did see the 'Failed to process recurrence rule' error on occassion.

I will try and run it some more times to see if that has any effect.
Can you verify the time zones set on the calendar and in the UI?

Also, what times besides 0500 did you try?  Can you send me (privately
if you wish) the calendar address usern...@domain.tld or
calen...@group.calendar.google.com?

Thanks!

-Ryan


 
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Charlie Wood  
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 More options Jan 3 2007, 5:12 pm
From: "Charlie Wood" <charlie.w...@gmail.com>
Date: Wed, 03 Jan 2007 14:12:58 -0800
Local: Wed, Jan 3 2007 5:12 pm
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)
I verified that the timezones on the UI and the calendar are both set
to "(GMT-06:00) Central Time".

This morning, I tried recurrences starting at 0100, 0200, 0300, etc.,
through 1000 (local time). Two of them go offset back an hour: the one
at 0200 and another one I don't remember.

I just ran the test again and got the same result--2 our of 10
recurrences got pushed back 1 hour. But they're not at the same start
times as the ones this morning. This time they're at 0600 and 0900.

This is all on my default calendar (for charlie.w...@gmail.com). I'll
leave the events in there for now so you can check it out if you can
get to them.

Regards,
Charlie


 
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Ryan Boyd (Google) Google employee  
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 More options Jan 3 2007, 10:20 pm
From: "Ryan Boyd (Google)" <api.rb...@google.com>
Date: Thu, 04 Jan 2007 03:20:01 -0000
Local: Wed, Jan 3 2007 10:20 pm
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)
I think I accidently hit 'Reply to author' on this one.

I have been able to successfully recreate this issue -- thanks to
Charlie and all the information he provided.

While we will work to resolve this issue on our side, I did notice
during my testing that there is a way  for the client to check whether
the event was properly created.  The gd:recurrence element in the
response does include an incorrect value for those times when the time
for the event is offset.

For instance, after submitting the following:
DTSTART;TZID=America/Chicago:20061231T080000
the following was returned:
DTSTART;TZID=America/Chicago:20061231T070000

If you wish to handle this issue before the bug is resolved, you could
look at the resulting gd:recurrence element and edit the event if
necessary.

Thanks again Charlie.

Cheers,

-Ryan


 
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Charlie Wood  
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 More options Jan 4 2007, 7:37 am
From: "Charlie Wood" <charlie.w...@gmail.com>
Date: Thu, 04 Jan 2007 12:37:47 -0000
Local: Thurs, Jan 4 2007 7:37 am
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)
Thanks, Ryan. I'm hesitant to write the workaround code, knowing that
the bug will be fixed. But if it's going to be a while (weeks) before
it is, I'll go ahead and do so. Can you hazard a guess as to when that
might be? (Hours/days/weeks/fortnights?)

Thanks again.
-Charlie


 
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Derek  
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 More options Jan 4 2007, 12:20 pm
From: "Derek" <derek.tin...@timesearchinc.com>
Date: Thu, 04 Jan 2007 09:20:52 -0800
Local: Thurs, Jan 4 2007 12:20 pm
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)
Thanks Ryan and Charlie.

I'd like to update our QA team to be aware of this issue, can you
provide any guidance regarding what factors are involved in the
manifestation of these recurrence issues?

Any and all recurring events, specific TZ/times...

Thanks in advance,
Derek.
http://www.calgoo.com


 
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Ryan Boyd (Google) Google employee  
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 More options Jan 5 2007, 11:51 am
From: "Ryan Boyd (Google)" <api.rb...@google.com>
Date: Fri, 05 Jan 2007 16:51:58 -0000
Local: Fri, Jan 5 2007 11:51 am
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)
Hi Derek,

We haen't found the exact cause yet, so I can only give you guidance
from my tests.

With the given syntax, for doing a recurring even that repeats daily
for an indefinite period of time and lasts 60 minutes, I am able to
reproduce this with at least 4 different hours with the 12312006 start
date and using the US Central timezone (America/Chicago).

I was able to produce this on between 1 and 3 times out of 20 requests
in each batch run.

I'll post to the groups when I have more information about this bug.

Cheers,

-Ryan

On Jan 4, 9:20 am, "Derek" <derek.tin...@timesearchinc.com> wrote:


 
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Charlie Wood  
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 More options Feb 9 2007, 12:17 am
From: "Charlie Wood" <charlie.w...@gmail.com>
Date: Thu, 08 Feb 2007 21:17:44 -0800
Local: Fri, Feb 9 2007 12:17 am
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)
Ryan,

I'm still seeing this behavior. Any news?

Thanks,
Charlie

On Jan 5, 10:51 am, "Ryan Boyd (Google)" <api.rb...@google.com> wrote:


 
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Rolsch  
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 More options Feb 9 2007, 6:31 am
From: "Rolsch" <pcpra...@gmx.ch>
Date: Fri, 09 Feb 2007 03:31:32 -0800
Local: Fri, Feb 9 2007 6:31 am
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)
I had a similar problem - perhaps connected?!
I'm working directly with xlms/atom and not with gdata...

This example will reproduce the error, because the previous year is
not defined in VTIMEZONE and 20070205 is "before" BEGIN:DAYLIGHT

<gd:recurrence>DTSTART;TZID=Europe/Zurich:20070205T100000
DURATION:PT3600S
RRULE:FREQ=DAILY;INTERVAL=1;UNTIL=20070206T090000Z
BEGIN:VTIMEZONE
TZID:Europe/Zurich
X-LIC-LOCATION:Europe/Zurich
BEGIN:DAYLIGHT
DTSTART:20070325T010000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:Europe/Zurich
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:20071028T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:Europe/Zurich
END:STANDARD
END:VTIMEZONE
</gd:recurrence>

Adding also...
BEGIN:DAYLIGHT
DTSTART:20060326T010000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:Europe/Zurich
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:20061029T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:Europe/Zurich
END:STANDARD
solved my problem...


 
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Ryan Boyd (Google) Google employee  
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 More options Feb 9 2007, 6:55 pm
From: "Ryan Boyd (Google)" <api.rb...@google.com>
Date: Fri, 9 Feb 2007 15:55:05 -0800
Local: Fri, Feb 9 2007 6:55 pm
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)

Hi Charlie,

We are aware of and can reproduce the problem.  We are working on fixing it,
but unfortunately I can't give a timeframe.

Thanks for the reminder.

Cheers,
-Ryan

On 2/8/07, Charlie Wood <charlie.w...@gmail.com> wrote:


 
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kulvinder_iitd@yahoo.com  
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 More options Feb 15 2007, 8:06 am
From: "kulvinder_i...@yahoo.com" <kulvinder_i...@yahoo.com>
Date: Thu, 15 Feb 2007 05:06:18 -0800
Local: Thurs, Feb 15 2007 8:06 am
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)
Hi Ryan,

I also got this problem today morning. My Outlook and Google TimeZones
are both at GMT -5:00 EST. One of my Outlook Recurring event was at
9:00 AM of duration 30 minutes. It was created in Google at 8:00 AM
instead. Other recurring events in the Outlook Calendar were at the
right time in Google.

When i updated my Oultook event and pushed in Google again, the wrong
event was shifted to right time. I think the time shiftin of -1 hour
occurs only while adding the events in Google calendar.

Any ideas ?

On Feb 9, 6:55 pm, "Ryan Boyd (Google)" <api.rb...@google.com> wrote:


 
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Ryan Boyd (Google) Google employee  
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 More options Feb 15 2007, 3:16 pm
From: "Ryan Boyd (Google)" <api.rb...@google.com>
Date: Thu, 15 Feb 2007 12:16:54 -0800
Local: Thurs, Feb 15 2007 3:16 pm
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)

Hi Kulvinder,

Thanks for the corroboration of the report.

Yes, we have tracked down the bug and are working on resolving it.
Unfortunately, it's not as simple of a fix as it sounds, so I can't give any
timeline for resolution.

I'll post a note to the group when this is resolved.

Thanks again,

-Ryan

On 2/15/07, kulvinder_i...@yahoo.com <kulvinder_i...@yahoo.com> wrote:


 
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dave  
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 More options Feb 16 2007, 10:32 am
From: "dave" <davekamin...@gmail.com>
Date: Fri, 16 Feb 2007 15:32:16 -0000
Local: Fri, Feb 16 2007 10:32 am
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)

FWIW I've been seeing this sporadic off-by-one-hour behavior also on
other Google services, most notably Search History and Blogger.
However the time error seen in those two services has been one hour
ahead instead of one hour behind as Kulvinder described.
-dave

On Feb 15, 3:16 pm, "Ryan Boyd (Google)" <api.rb...@google.com> wrote:


 
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Charlie Wood  
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 More options Feb 16 2007, 10:51 am
From: "Charlie Wood" <charlie.w...@gmail.com>
Date: Fri, 16 Feb 2007 15:51:38 -0000
Local: Fri, Feb 16 2007 10:51 am
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)
Interesting! Maybe some day Ryan and Frank will describe for us how
the gCal back-end works. Until then I find it useful to consider it
mysterious and mystical.

:-)
-c

On Feb 16, 9:32 am, "dave" <davekamin...@gmail.com> wrote:


 
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Ryan Boyd (Google) Google employee  
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 More options Feb 16 2007, 1:40 pm
From: "Ryan Boyd (Google)" <api.rb...@google.com>
Date: Fri, 16 Feb 2007 10:40:19 -0800
Local: Fri, Feb 16 2007 1:40 pm
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)

Hi Dave,

Thanks for the information.  If you have any more details on these problems
with Search History and Blogger, please let me know and I'll get the
information to the right people.

Meanwhile, we are working on solving this problem in Calendar.

Thanks,

-Ryan

On 2/16/07, dave <davekamin...@gmail.com> wrote:


 
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Philipp Kewisch  
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 More options Feb 17 2007, 4:25 pm
From: "Philipp Kewisch" <kewi...@gmail.com>
Date: Sat, 17 Feb 2007 21:25:50 -0000
Local: Sat, Feb 17 2007 4:25 pm
Subject: Re: Recurrences intermittently getting offset (by 1 hour?)
Maybe this has to do with the forthcoming timezone changes in March?
The Mozilla Calendar team is working hard on just that issue, maybe
you are having similar difficulties?

Philipp

On Feb 16, 7:40 pm, "Ryan Boyd (Google)" <api.rb...@google.com> wrote:


 
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