Month calendar renders events weirdly around DST

[richardolsson]

Description

In the "Project & activities" section of Zetkin, there is a calendar with three view modes (day, week, month). In the month view there should be one item for each event in the calendar. There is some bug related to DST causing a single event to be displayed four times instead of just once.

Steps to reproduce

1. Go to https://app.dev.zetkin.org/organize/1/projects
2. Go into any project or create a new one
3. Create a new event
4. Set the date to whenever DST ends, currently March 30
5. Set time to 9.30 - 15.00
6. Go back to the project
7. Go to the calendar
8. Switch to month view and navigate to the month of the event

Expected Behaviour

The event should appear once in the calendar, on the day that it was planned (e.g. March 30).

Actual Behaviour

The event appears four times in the calendar, twice on the correct date and twice on the next day.

Screenshots (if you have any)

Step 8

Example from production

I discovered this bug when I was creating hackathons. This screenshot is of two hackathon events, but they are displayed 8 times.

[xela1601]

Hey @richardolsson,

i would like to pick this issue for my 2nd contribution. What do you think?

[richardolsson]

Hey @richardolsson,

i would like to pick this issue for my 2nd contribution. What do you think?

Go for it! 💯

[xela1601]

great. Can you assign it to me?