Calendar events showing on wrong day.

[flyedge]

I have noticed that some events (particularly those later in the day, or all day events) have been showing up a day late. I have tried adjusting the config options to absolute on the calendar module, as well as updating to the most recent develop version, however neither of these have fixed the issue. Has anyone else had run into this issue, or know how to fix it?

[sdetweil]

@flyedge what time zone are you in and the calendar entry?

[flyedge]

@sdetweil both the Calendar, and my Magic mirror are on the Mountain/Edmonton time zone.

[sdetweil]

@flyedge can u post one event from the ICS file… use the URL in the cal setting in a browser, it downloads the ics, which is just text

I want to see one

BEGIN:VEVENT
...
END:VEVENT

[flyedge]

@sdetweil This event shows on the 22nd at 6pm rather than the 23rd. I do notice that for some reason the event shows as Vancouver time zone rather than Edmonton, perhaps that could be affecting something (even though it should only be 1 hour different…)

BEGIN:VEVENT
DTSTART;TZID=America/Vancouver:20201126T170000
DTEND;TZID=America/Vancouver:20201126T180000
RRULE:FREQ=MONTHLY;WKST=SU;BYMONTHDAY=23
DTSTAMP:20211118T181948Z
UID:55A45619-xxxxx-4425-xxxx-1EFBAFDC2DE0
CREATED:20201119T060211Z
DESCRIPTION:
LAST-MODIFIED:20201119T060211Z
LOCATION:
SEQUENCE:0
STATUS:CONFIRMED
SUMMARY:Test
TRANSP:OPAQUE
END:VEVENT

[sdetweil]

@flyedge thanks… it seems a fix I put in early last year has been lost… trying to find out where…

the library (not ours) that does repeating events, expects the date/time to be local time, no timezone

we and the ics parse libraries expect the date/time to be utc time…

so, your cal entry

DTSTART;TZID=America/Vancouver:20201126T170000
DTEND;TZID=America/Vancouver:20201126T180000
RRULE:FREQ=MONTHLY;WKST=SU;BYMONTHDAY=23

is processed

Search for recurring events between: Thu Nov 18 2021 14:25:16 GMT-0600 (Central Standard Time) and Thu Nov 17 2022 23:59:59 GMT-0600 (Central Standard Time)

Vancouver is -8, so 17+8-24 = 1 so utc time is next day +1

[18.11.2021 14:25.16.441] [DEBUG] Title: Test, with dates:
rrule returned dates

[
"2021-11-23T01:00:00.000Z",     next day +1.. except...  the start day was 23, so this should be 24:1 (-8) = 23/17:00

so the luxon library didn't know about tz, and used the HOUR 1, as the repeating start time, on the 23rd.. 

"2021-12-23T01:00:00.000Z",
"2022-01-23T01:00:00.000Z",
"2022-02-23T01:00:00.000Z","2022-03-23T01:00:00.000Z","2022-04-23T01:00:00.000Z","2022-05-23T01:00:00.000Z","2022-06-23T01:00:00.000Z","2022-07-23T01:00:00.000Z","2022-08-23T01:00:00.000Z","2022-09-23T01:00:00.000Z","2022-10-23T01:00:00.000Z"]

if u change your system tz to Vancouver it should come out correct…

to temp fix, try this

edit modules/default/calendar/calendarutils.js

there are two occurrences (approx line 348 and line 376) of this code

								// if the timezones are the same, correct date if needed
								if (event.start.tz === moment.tz.guess()) {
									// if the date hour is less than the offset
									if (24 - dh <= Math.abs(dateoffset / 60)) {
										// apply the correction to the date/time back to right day
										date = new Date(date.getTime() + Math.abs(24 * 60) * 60000);
										// the duration was calculated way back at the top before we could correct the start time..
										// fix it for this event entry
										//duration = 24 * 60 * 60 * 1000;
										Log.debug("new recurring date2 is " + date);
									}
								}

we need to comment out the test for same timezone, it has a block if code inside the {} so we need to comment out the
} at the end as well
change like this

								// if the timezones are the same, correct date if needed
								//if (event.start.tz === moment.tz.guess()) {  <---- this line
									// if the date hour is less than the offset
									if (24 - dh <= Math.abs(dateoffset / 60)) {
										// apply the correction to the date/time back to right day
										date = new Date(date.getTime() + Math.abs(24 * 60) * 60000);
										// the duration was calculated way back at the top before we could correct the start time..
										// fix it for this event entry
										//duration = 24 * 60 * 60 * 1000;
										Log.debug("new recurring date2 is " + date);
									}
								//}   <- --- this line

[flyedge]

@sdetweil okay, I went through and changed my original calendar to make sure all events were in the correct time zone, but I was able to make a test event that was the same as the example. If I am understanding correctly, you want me to add // immediately in front of the “if (event.start…” as well as the second set of brackets at the end, two lines down from the “Log.debug…” line, around about lines 348 and 376?

I did try this, both with the system time zone in Edmonton, and Vancouver. Both resulted in the event still displaying on the 22nd.
I may have misunderstood what you were asking though as I am very new to this, and have no previous experience with javascript, aside from what I have been able to learn in the last few weeks setting this up.

One other aside, I have also noticed that all day events are being displayed correctly ahead of time, as well as day of- however the day after the event is scheduled it will remain, and display as an event scheduled that day. (example event will show in 2 days, 2 days ahead of time, ends in x hours on day of, but also shows ends in x hours 1 day after event was scheduled). Is this related to the same type of timezone issues as the original?

[sdetweil]

@flyedge there are two instances of the if( and } that need to be commented out (//) right?

total of 4 lines (2 sets of 2)

1st one is for all day events
2nd one is for NOT full day events (which is what your event is , as it has time as well)

[Coolie1101]

Hey @sdetweil, I am experiencing the same issue and made the changes as you motioned, but now I am getting an error for the calendar module, and the module is not loaded, if I revert the module loads and work as expected, any ideas?

Config Change

} else { 
								// if the timezones are the same, correct date if needed
//								if (event.start.tz === moment.tz.guess()) {
									// if the date hour is less than the offset
									if (24 - dh < Math.abs(dateoffset / 60)) {
										// apply the correction to the date/time back to right day
										date = new Date(date.getTime() + Math.abs(24 * 60) * 60000);
										// the duration was calculated way back at the top before we could correct the start time..
										// fix it for this event entry
										//duration = 24 * 60 * 60 * 1000;
										Log.debug("new recurring date2 is " + date);
									}
//								}
							}
						} else {
							// not full day, but luxon can still screw up the date on the rule processing
							// we need to correct the date to get back to the right event for
							if (dateoffset < 0) {
								// if the date hour is less than the offset
								if (dh < Math.abs(dateoffset / 60)) {
									// Reduce the time by the offset:
									// Apply the correction to the date/time to get it UTC relative
									date = new Date(date.getTime() - Math.abs(nowOffset) * 60000);
									// the duration was calculated way back at the top before we could correct the start time..
									// fix it for this event entry
									//duration = 24 * 60 * 60 * 1000;
									Log.debug("new recurring date1 is " + date);
								}
							} else {
								// if the timezones are the same, correct date if needed
//								if (event.start.tz === moment.tz.guess()) {
									// if the date hour is less than the offset
									if (24 - dh < Math.abs(dateoffset / 60)) {
										// apply the correction to the date/time back to right day
										date = new Date(date.getTime() + Math.abs(24 * 60) * 60000);
										// the duration was calculated way back at the top before we could correct the start time..
										// fix it for this event entry
										//duration = 24 * 60 * 60 * 1000;
										Log.debug("new recurring date2 is " + date);
									}
//								}
							}
						}
						startDate = moment(date);

[sdetweil]

@coolie1101 said in Calendar events showing on wrong day.:

Config Change

you don’t change config, you are changing the module source code, right?

4 lines in 1 file