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The next problem emerges when 2/6 of the countries with DST decide to observe what we call summer time, 2/6 decide to change to winter time, 1/6 decide to continue observing DST following the US model and 1/6 decide to continue observing DST following the European model.

https://xkcd.com/927/

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That's called "different timezones", which we know how to deal with. (Although there is a certain attraction to everybody observing UTC.)

There was no standard to begin with - switching to happens on different dates in different countries.

Exactly. Sweden, for example, switches several weeks before the US in the fall and spring leading to a bizarre situation where the two countries are only X-1 hours apart instead of X hours. It has the strange (but sensical) effect of also moving meetings by one hour on Swedish calendars. But only meetings that were created by Americans! If the meeting was created by a Swede it moves one hour on the American calendar. This inevitably leads to some confusion. So we already have this problem, whether or not there is DST or not won’t really make it worse.

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