calendar - wrong repeating count when using sliceMultiDayEvents

[MarcLandis]

@sdetweil I know that parsing ics is a pita, but before I submit an issue at github, I wanted to have a quick discussion here in the forum.

When using the sliceMultiDayEvents config option the calendar shows an additional day. This is probably caused by the RRule parsing.

The code that causes this starts here

BEGIN:VCALENDAR
PRODID:-//Google Inc//Google Calendar 70.9054//EN
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Dirk Test
X-WR-TIMEZONE:Europe/Berlin
BEGIN:VEVENT
DTSTART;VALUE=DATE:20240918
DTEND;VALUE=DATE:20240919
DTSTAMP:20240916T084410Z
UID:2crbv1ijljc2kt9jclkgu5hqa0@google.com
CREATED:20240916T083831Z
LAST-MODIFIED:20240916T083831Z
SEQUENCE:0
STATUS:CONFIRMED
SUMMARY:1 day single
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20240919
DTEND;VALUE=DATE:20240920
RRULE:FREQ=YEARLY
DTSTAMP:20240916T084410Z
UID:6gb19havnq6vp2qput51e5rmml@google.com
CREATED:20240916T083850Z
LAST-MODIFIED:20240916T083850Z
SEQUENCE:0
STATUS:CONFIRMED
SUMMARY:1 day repeat
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20240920
DTEND;VALUE=DATE:20240922
DTSTAMP:20240916T084410Z
UID:06e9u1trbqi3jbvstvq4qqutau@google.com
CREATED:20240916T083902Z
LAST-MODIFIED:20240916T083902Z
SEQUENCE:0
STATUS:CONFIRMED
SUMMARY:2 day single
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20240923
DTEND;VALUE=DATE:20240925
RRULE:FREQ=YEARLY
DTSTAMP:20240916T084410Z
UID:0ui78rk6hpcv8rmbb6nuonhmgg@google.com
CREATED:20240916T083919Z
LAST-MODIFIED:20240916T083919Z
SEQUENCE:0
STATUS:CONFIRMED
SUMMARY:2 day repeat
TRANSP:TRANSPARENT
END:VEVENT
END:VCALENDAR

[sdetweil]

@MarcLandis said in calendar - wrong repeating count when using sliceMultiDayEvents:

sliceMultiDayEvents

thanks for the config

looking at the results without sliceMultiDayEvents
I see

so the parsing was correct, the visual, we only show the start date, even if multi-day
so both are ‘correct’ tho not informative

with split day

I don’t see any difference in the calendar parsing. (add “DEBUG” to the loglevel list in config.js)
and redirect the npm start output to a file

Calendar-Fetcher: Broadcasting 4 events from http://localhost:8090/modules/default/calendar/splitdays_test.ics. 

only 4 events… so not calendar parsing,
the only place the split parm is used is in the front end… calendar.js
but my output is different than yours.

I am using the develop branch, coming Oct 1. however I don’t see a documented change here
this split code was added in 2019…
also tested on master (2.28.0) with same 4 lines of results

you can get the develop branch and try it…
https://forum.magicmirror.builders/topic/14327/testing-new-fixes-or-solving-current-problems-with-next-release-code

I just copy/pasted your ics info in a file, unchanged

I tested with America/Chicago timezone.

[MarcLandis]

@sdetweil I am pretty sure it has to do with timezone settings. I am going to test some things on my end.

btw: I have this problem for a long time and more or less always ignored it.

[MarcLandis]

@MarcLandis so it doesn’t happen when setting the time zone to America/Chicago but it happens for Europe/Berlin.

[sdetweil]

@MarcLandis ok. system timezone.

[sdetweil]

@MarcLandis interesting…

change calendar.js 3 places
give it a try

change (line 633)

const maxCount = Math.ceil((event.endDate - 1 - moment(event.startDate, "x").endOf("day").format("x")) / ONE_DAY) + 1;

to

const maxCount = Math.round((event.endDate - 1 - moment(event.startDate, "x").endOf("day").format("x")) / ONE_DAY) + 1;

ceil takes 1.04 to 2, round to 1

					let midnight
						= moment(event.startDate, "x")
							.clone()
							.startOf("day")
							.add(1, "day")
							.endOf('day')  // add this (else its start of day, not end) line 641
							.format("x");

and recalc of midmnight (line split like above for clarity) line 654

	midnight = moment(midnight, "x")
                                   .add(1, "day")
                                   .endOf('day')  // add this 
                                   .format("x"); // next day

works in Europe/Berlin and America/Chicago 
2 bugs
1 count incorrect
2 loop control

[MarcLandis]

@sdetweil this fixes it. The test calendar looks good and my real one with the birthdays (mostly affected one) is perfect. All other events are good too.

Thx for your help.

[sdetweil]

@MarcLandis i’ll submit an issue and a pr…

and a testcase

[sdetweil]

@MarcLandis
submitted PR https://github.com/MagicMirrorOrg/MagicMirror/pull/3543/
with new testcase to validate

hopefully we will get it into next release Oct 1.

[MarcLandis]

@sdetweil Thank you - even it doesn’t make it into the next release I have a way to manually fix it now.