Displayed time incorrect in logged out state

[MrKrisKrisu]

Describe the bug
A user reported that since the timezone update, there is a discrepancy in the displayed train schedule on their profile. When viewing the profile without logging in, a train scheduled for 19:10 is incorrectly shown as 17:10. However, upon logging in, the correct time of 19:10 is displayed for the same train journey.

To Reproduce
Steps to reproduce the behavior:

1. Visit the user's profile in an unlogged state.
2. Locate the train departure time for a specific train, e.g., 19:10.
3. Observe that the displayed time is incorrect, showing 17:10 instead.

Expected behavior
The user expects that the displayed train schedule in both logged-in and unlogged states should consistently show the correct departure time of 19:10.

Screenshots

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Additional context
Internal Ticket #220064

[TobiTobsen1410]

Hi guys,
Since the timezone feature came up, trains show a different time when I’m logged out (minus 2 hours) than when I’m logged in into my profile.
I attached two pictures to this message to show you the problem.
Cheers, Tobi

[HerrLevin]

Temporary fix w/ #1963 - This will only be fixed, once we can handle all date/time formatting in the frontend. A better backend time formatting is just not worth it in this case.