bug: events duplicated in v3.1.0.

[zoifar]

Duplicated instances of the same event are returned in v3.1.0. The bug is not present in v2.1.3.

To Reproduce

import recurring_ical_events
import icalendar
ical_string="""BEGIN:VCALENDAR
BEGIN:VEVENT
DTSTAMP:20240821T032819Z
DTSTART;VALUE=DATE:20240401
DTEND;VALUE=DATE:20240408
SUMMARY:test123
CATEGORIES:other
UID:111
ORGANIZER:aaa
RRULE:FREQ=WEEKLY;INTERVAL=3;BYDAY=MO
CREATED:20240311T051101Z
LAST-MODIFIED:20240311T051101Z
SEQUENCE:1
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20240821T032820Z
DTSTART;VALUE=DATE:20240826
DTEND;VALUE=DATE:20240902
SUMMARY:test123
CATEGORIES:other
UID:111
ORGANIZER:aaa
RRULE:FREQ=WEEKLY;INTERVAL=3;BYDAY=MO
RECURRENCE-ID;VALUE=DATE:20240826
CREATED:20240729T125457Z
LAST-MODIFIED:20240729T125457Z
SEQUENCE:1
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20240821T032820Z
DTSTART;VALUE=DATE:20240826
DTEND;VALUE=DATE:20240902
SUMMARY:test123
CATEGORIES:other
UID:111
ORGANIZER:aaa
RRULE:FREQ=WEEKLY;INTERVAL=3;BYDAY=MO
RECURRENCE-ID;VALUE=DATE:20240826
CREATED:20240729T125551Z
LAST-MODIFIED:20240729T125551Z
SEQUENCE:1
END:VEVENT
END:VCALENDAR
""" 


calendar = icalendar.Calendar.from_ical(ical_string)
events=recurring_ical_events.of(calendar).at([2024,8])

for event in events:
    start = event["DTSTART"].dt
    duration = event["DTEND"].dt - event["DTSTART"].dt
    print("start {} duration {}".format(start, duration))

ICS file

BEGIN:VCALENDAR
BEGIN:VEVENT
DTSTAMP:20240821T032819Z
DTSTART;VALUE=DATE:20240401
DTEND;VALUE=DATE:20240408
SUMMARY:test123
CATEGORIES:other
UID:111
ORGANIZER:aaa
RRULE:FREQ=WEEKLY;INTERVAL=3;BYDAY=MO
CREATED:20240311T051101Z
LAST-MODIFIED:20240311T051101Z
SEQUENCE:1
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20240821T032820Z
DTSTART;VALUE=DATE:20240826
DTEND;VALUE=DATE:20240902
SUMMARY:test123
CATEGORIES:other
UID:111
ORGANIZER:aaa
RRULE:FREQ=WEEKLY;INTERVAL=3;BYDAY=MO
RECURRENCE-ID;VALUE=DATE:20240826
CREATED:20240729T125457Z
LAST-MODIFIED:20240729T125457Z
SEQUENCE:1
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20240821T032820Z
DTSTART;VALUE=DATE:20240826
DTEND;VALUE=DATE:20240902
SUMMARY:test123
CATEGORIES:other
UID:111
ORGANIZER:aaa
RRULE:FREQ=WEEKLY;INTERVAL=3;BYDAY=MO
RECURRENCE-ID;VALUE=DATE:20240826
CREATED:20240729T125551Z
LAST-MODIFIED:20240729T125551Z
SEQUENCE:1
END:VEVENT
END:VCALENDAR

Expected behavior

duplicated events are not returned

start 2024-08-05 duration 7 days, 0:00:00
start 2024-08-26 duration 7 days, 0:00:00

Console output

start 2024-08-05 duration 7 days, 0:00:00
start 2024-08-26 duration 7 days, 0:00:00
start 2024-08-26 duration 7 days, 0:00:00

Version:
3.1.0

pip list                         
Package               Version
--------------------- -----------
icalendar             5.0.13
pip                   23.3.1
python-dateutil       2.9.0.post0
pytz                  2024.1
recurring-ical-events 3.1.0
setuptools            69.0.2
six                   1.16.0
tzdata                2024.1
x-wr-timezone         0.0.7

Additional context

This is generated by atlassian confluence calendar.

---

We're using Polar.sh so you can upvote and help fund this issue. We receive the funding once the issue is completed & confirmed by you. Thank you in advance for helping prioritize & fund our work.

[niccokunzmann]

Thanks for the issues!

[niccokunzmann]

This is fixed in v3.1.1.