fix(web): let event dates be timezone-independent

[sruenwg]

Fixes half of #542.

This PR makes it so the displayed event dates are no longer dependent on user time zone.
E.g. if an event has date 2024-11-11T00:00:00Z, the event is listed as being on 2024-11-11 in all time zones.

spodule-event-date-no-tz-1.mp4

Regarding the rest of #542, I am unsure if we should apply the same change as above to site news items since, on second thought, I feel site news items do carry time information.
E.g. if the Discord bot was released on 2023-09-05T00:00:00Z, from the perspective of a user in Los Angeles, it might make more sense to say that the bot was released on 2023-09-04.
@sugar-cat7 Please let me know which you would prefer.

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[sugar-cat7]

Regarding the rest of #542, I am unsure if we should apply the same change as above to site news items since, on second thought, I feel site news items do carry time information.

@sruenwg
Personally, I think it would be better for site news items not to depend on the user’s time zone either. Like events, we round the display to 00:00:00, so making it dependent on time zones may not be ideal.

[sugar-cat7]

LGTM

[sruenwg]

@sruenwg Personally, I think it would be better for site news items not to depend on the user’s time zone either. Like events, we round the display to 00:00:00, so making it dependent on time zones may not be ideal.

Sounds good, will raise a separate PR for that.