Open Bug 450407 Opened 17 years ago Updated 3 years ago

Missing rule parts (e.g,. BYMONTH) in RRULE are not properly derived from DTSTART

Categories

(Calendar :: General, defect)

Product:
Calendar
Component:
General
Type:
defect

Tracking

(Not tracked)

People

(Reporter: bernard.desruisseaux, Unassigned)

Details

User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.16) Gecko/20080702 Firefox/2.0.0.16 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.16) Gecko/20080708 Lightning/0.9pre Thunderbird/2.0.0.16 (Build 2008081218) Mozilla Lightning generates recurrence instances on the Monday preceding the 25th of *every month* while it should only generate recurrence instances in the month of May: BEGIN:VCALENDAR PRODID:Bernard VERSION:2.0 BEGIN:VEVENT UID:quebec-national-patriots-day-001 DTSTAMP:20080812T232154Z SUMMARY:Quebec National Patriots Day DTSTART;VALUE=DATE:20090518 RRULE:FREQ=YEARLY;BYDAY=MO;BYMONTHDAY=18,19,20,21,22,23,24 DESCRIPTION:The Monday preceding May 25th URL:http://www.cnt.gouv.qc.ca/en/leaves-and-absences/statutory-holidays/index.html END:VEVENT END:VCALENDAR BYMONTH=5 should have been derived from DTSTART as specified in RFC 2445: http://tools.ietf.org/html/rfc2445#page-44 > Information, not contained in the rule, necessary to determine the > various recurrence instance start time and dates are derived from the > Start Time (DTSTART) entry attribute. For example, > "FREQ=YEARLY;BYMONTH=1" doesn't specify a specific day within the > month or a time. This information would be the same as what is > specified for DTSTART. For what is worth, Mozilla Lightning works properly when adding BYMONTH=5 to the RRULE. Reproducible: Always Steps to Reproduce: 1. Import VEVENT mentionned in the bug's details. 2. Notice there are recurrence instances displayed in June, July, and so forth. Actual Results: Recurrence instances displayed in June, July, and so forth. Expected Results: Recurrence instaces should only be displayed in the month of May of every year.
I think this needs fixing in libical, because it expands the RRULEs. We should first check whether trunk libical (which mvl has updated some time ago) has fixed this already.
Status: UNCONFIRMED → NEW
Ever confirmed: true
OS: Windows XP → All
Hardware: PC → All
Just for reference: Importing the event in Google Calendar (via web, not from Sunbird/Lightning) shows the event every month too.
Just for reference: Importing the event in Apple iCal 3.0.4 shows the event on May 18, 19, 20, 21, 22, 23, and 24 of every year. Different wrong behavior.
Just for reference: Importing the event (with or without BYMONTH=5) fails in Outlook 2003.
Additional information from rfc2445bis to clarify the expected result. http://ietfreport.isoc.org/idref/draft-ietf-calsify-rfc2445bis/#page-44 > BYxxx rule parts for a period of time less than the frequency generally > increase or expand the number of occurrences of the recurrence. > For example, "FREQ=YEARLY;BYMONTH=1,2" increases the number of > days within the yearly recurrence set from 1 (if BYMONTH rule part > is not present) to 2. http://ietfreport.isoc.org/idref/draft-ietf-calsify-rfc2445bis/#page-45 According to the table on this page the BYMONTH rule part would "Expand" the recurrence set when FREQ=YEARLY.
Just for reference: Evolution also has issues with such events Bug 499180 - BYDAY and BYMONTHDAY combination show to many entries (Evolution) http://bugzilla.gnome.org/show_bug.cgi?id=499180
Severity: normal → S3
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