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Adjusting the time allows to have more natural lights. It saves a lot of electricity.

That doesn't seem true - when the US extended summer time it ended up costing more electricity.

And if it was true, you can just extend it year round. Winter is when summer time is really needed anyway.

Russia tried that for 3 years, now they use normal time the hole year. It seems only "summer time" is not a good idea either.