Month View: events not rendering for the last day of the week.

[davidfaulks]

Check that this is really a bug

• [X] I confirm

Reproduction link

n/a

Bug description

In monthly view, multi-day events are not rendering for the last day of the week. Unfortunately, my attempts to make a 'toy example' do not show the error. Changing localization does not affect the issue.

Expected Behavior

Multi-day events should render for the last day of the week.

Actual Behavior

No response

react-big-calendar version

1.11.1

React version

18.2.0

Platform/Target and Browser Versions

macOS Safari 17.31

Validations

• [X] Read the docs.
• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.
• [X] Make sure this is a react-big-calendar issue and not an implementation issue

Would you like to open a PR for this bug?

• [ ] I'm willing to open a PR

[davidfaulks]

I have now confirmed that this happens if the timezone is GMT or larger (eastern hemisphere). I am using the moment localizer, which I know is considered old fashioned nowadays. I will switch to a different date library and report the effects (later).

[davidfaulks]

Changing to the luxon localizer has no effect, the bug still occurs.

[davidmh]

~I think I ran into an instance of the same issue here: https://github.com/jquense/react-big-calendar/pull/2537#discussion_r1524166092~

~So maybe we should update getDateForSlot to turn the one-based slots into zero-based indexes~

That seems to be a separate issue.

[davidmh]

And while rendering the events, I've come up with a temporary solution by adding one second to the end of the range, just to push it over the edge.

[davidfaulks]

After some more checking, I'll have amend this to 'any timezone with a greater offset than local time'