All day events can display the wrong date depending on user's timezone

I assume @Samwilson added an all-day event on the 15th that because of his timezone is displaying as the 14th to most of us? Is that right?

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Yep, exactly that! Which is odd, because most calendars do ‘all day’ events by date rather than a 24 hour period in a particular timezone. And interestingly, when setting up an all day even there is no timezone selection box.

Really, Wikipedia Day runs from 00:00 in UTC-12 to 24:00 in UTC+14 (i.e. 50 hours).

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This had been brought up previously in a slightly different context Showing full day events in local time may lead to confusing results. I’ve just filed a task for it (T240293) and will likely flag this issue for fixing along with a batch of other minor fixes to the calendar.

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