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Okay, let's keep timezones. You still don't know if it's appropriate to call your friend in Australia at 8AM their time, even if it totally is in Switzerland. Nor do you know whether calling at 8PM will interrupt someone's dinner or not.

Even within the same timezone, countries/cultures differ. And even within the same country/culture, people differ.

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This particular one I live with constantly being in tech and living on a ranch in the US west.

I'd never call a tech friend at 8am, I might well wake them up. And I'd never call a rancher after 8 - they will be working without cell. 6-7am is ideal they will still be working, but hopefully inside cell range with a cup of coffee.

It is still a lot easier to remember information like “Portuguese people tend to eat dinner late” than “the average Portuguese dinner time is from <some UTC offset> to <some other UTC offset>”.

This is really an incredibly narrow use-case in the modern world. It's very easy to ignore a phone call nowadays if you're busy. Avoiding global times just to gain an incredibly inaccurate estimate of when someone might be busy is not a very compelling argument.

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