CalDAV times all wrong

[OdinVex]

Checklist

• I have updated to the latest available Home Assistant version.
• I have cleared the cache of my browser.
• I have tried a different browser to see if it is related to my browser.
• I have tried reproducing the issue in safe mode to rule out problems with unsupported custom resources.

Describe the issue you are experiencing

All times are wrong, they're off by my timezone.

Describe the behavior you expected

Correct times.

Steps to reproduce the issue

1. Add Radicale URI and login to CalDav wizard during start.
2. View Calendar (even after reboot).
   ...

What version of Home Assistant Core has the issue?

2024.9.1

What was the last working version of Home Assistant Core?

No response

In which browser are you experiencing the issue with?

LibreWolf x64

Which operating system are you using to run this browser?

Linux Manjaro x64

State of relevant entities

No response

Problem-relevant frontend configuration

No response

Javascript errors shown in your browser console/inspector

No response

Additional information

Android DAVx5 and KDE Kontact show the times correctly, they use the same source as CalDAV. The server timezone is set correctly, I've rebooted multiple times.