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Comment by scythe

4 hours ago

Thankfully, this is a situation we don't need to speculate about without evidence. Spain is on de facto permanent DST, serving as a natural experiment. I bet the results support you.

That's partly because it's in the same timezone as Poland. Madrid is further west that London, but London is an hour behind. Moving Spain to permanent DST puts it on the same effective timezone as London.

http://blog.poormansmath.net/images/SolarTimeVsStandardTime....

Without the DST offset, Spain much more "red" than England.

It's not so much a "permeant DST" but rather a "we want to change to GMT without moving out of the CET timezone."

Spain instead adjusted it's entire country around the time.

And they still do DST. They're just on a different time zone than they should be because during WWII, they changed to the same time zone as Germany.