584581 - Recurring calendar event does not show correctly in tbird but Zimbra calendar shows correct scheduling

Status: RESOLVED DUPLICATE of bug 322458

(Calendar :: Lightning Only, defect)

Description

[qtrolazyg]

User-Agent:       Mozilla/5.0 (Windows; Windows NT 5.1; rv:2.0b2) Gecko/20100720 Firefox/4.0b2 ( .NET CLR 3.5.30729; .NET4.0E)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.7) Gecko/20100713 Lightning/1.0b2pre Thunderbird/3.1.1

Recurring calendar event is set for the 2nd Thursday each month.  Another event is set for the 4th Thursday each month.  Both show correctly in Zimbra's calendar.  Thunderbird shows the events occurring every Thursday. 

Reproducible: Always

Steps to Reproduce:
1. Add a recurring appointment set for the 2nd Thursday every month in Zimbra's calendar
2. Add a new calendar to Tbird
3. Choose On the Network and iCalendar(ICS)
4. Enter the URL for the calendar location
5. Enter a name for the calendar and select the zimbra email account

Actual Results:  
When the calendar loads, the appointment is showing for every Thursday, instead of once each month.

Expected Results:  
Expected the events in Tbird to appear the same as those in Zimbra.

 There were similar problems with other systems (i.e. Google), but I did not find one for Zimbra.

Other than that, I am loving the new calendar and Tbird.  Kudos to the team!
no special themes
extensions are lightning, minimizetotrayplus, and zindus
I have 4 calendars, 3 from Zimbra

Comment 1

[Stefan Sitter [:ssitter]]

Please attach the iCalendar (ics) sample that contains such an repeating event.

Comment 2

[Andrew Martin]

I am also experiencing this issue (Thunderbird 3.1.8 Lightning 1.0b2). I am using Zimbra as well. I have attached a sample event which is supposed to occur on the last wednesday of every month. This behavior is correctly reflected in the Zimbra web client, but Thunderbird displays it every wednesday.

The Zimbra web client lists the recurring rule as "The last Wednesday of every 1 months" whereas Thunderbird's recurrence pattern is "repeat monthly every 1 month(s) every Wednesday" (see attached screenshot).

Comment 3

[Andrew Martin]

Attachment: displays how Lightning misinterprets the recurring rule

Comment 4

[Andrew Martin]

Attachment: An example ICS file that causes this issue to occur

Comment 5

[Stefan Sitter [:ssitter]]

Andrew, your example RRULE uses BYSETPOS that is not yet supported. BYSETPOS is already tracked with existing Bug 322458.

qtrolazyg, feel free to reopen this report if you can provide the requested information.

Comment 6

[qtrolazyg]

Sorry for not paying attention.  I have downloaded the latest Lightning and T-bird and tried my calendars again.  The results are mixed.  One appointment is set for the Last Wednesday of each month, and it appears correctly in Lightning. Another appointment is the First Monday of each month and it shows every Monday in Lightning. What might be tripping it up is that one occurrence is missing, in Zimbra, for March 28th
Version information:
version 3.1.9
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; 
rv:1.9.2.15) Gecko/20110303 Lightning/1.0b3pre 
Thunderbird/3.1.9
(added attachments)

Comment 7

[qtrolazyg]

Attachment: Zimbra recurrence settings

This is an appointment called PreRelease Release

Comment 8

[qtrolazyg]

Attachment: Lightning recurrence settings

This is an appointment called PreRelease Release

Comment 9

[qtrolazyg]

Attachment: ICS file

This the export from Zimbra

Comment 10

[Stefan Sitter [:ssitter]]

Events with the following recurrence rule are found in your sample file:

> Line 130: RRULE:FREQ=MONTHLY;UNTIL=20101201;BYDAY=1TH
> Line 182: RRULE:FREQ=MONTHLY;BYDAY=1MO
> Line 278: RRULE:FREQ=MONTHLY;BYDAY=-1MO
> Line 365: RRULE:FREQ=MONTHLY;BYDAY=MO;BYSETPOS=1
> Line 386: RRULE:FREQ=MONTHLY;BYDAY=-1WE

The event "General Release" shows correct on every first Monday because it uses the supported rule "BYDAY=1MO".

The event "PreRelease Release" is probably the one you're talking about. It uses the rule "BYDAY=MO;BYSETPOS=1". BYSETPOS is not yet supported (Bug 322458) therefore Lightning shows the event on every Monday as specified by "BYDAY=MO". Maybe you can workaround by changing the recurrence rule to the former one.