Event displayed on the wrong date (probably TZ-related)

### What Happened?

An event that starts on the 8th of February on New Zealand time is shown as starting on the 8th even though it starts on the 7th on my local time.

### Steps to Reproduce

1. Create an event that starts at 10:00 and ends at 17:00 February 8th (GMT+13:00) New Zealand Time.
2. Set timezone to GMT-3 Buenos Aires


### Expected Behavior

The event should be shown on the date it starts locally.

### OS Version

6.x (Odin)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

_No response_