That’s wrong or at least not normally how the term “time zone” is used. We would typically say that Sweden is in one time zone whose offset changes twice a year.

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dijit 3 days ago | parent [-]

so CEST is what?

	▲	yencabulator a day ago \| parent \| next [-]
		Based on a quick skim, CEST is a "time" not a "time zone". https://en.wikipedia.org/wiki/Central_European_Summer_Time https://en.wikipedia.org/wiki/Time_zone https://en.wikipedia.org/wiki/Standard_time
	▲	umanwizard 2 days ago \| parent \| prev [-]
		An offset from UTC. Wikipedia calls it "the standard clock time observed during the period of summer daylight-saving in those European countries which observe Central European Time (CET; UTC+01:00) during the other part of the year." Note the word "zone" does not appear in the above.