Use function convertTimeZone();-

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var expectedTimezoneDateTime=new GlideScheduleDateTime().convertTimeZone("CET","GMT");

//You can provide a hardcoded value as well in the function GlideScheduleDateTime("02-02-2022 03:40:67");

var convertedTimeZoneDateTime= new GlideDateTime(expectedTimezoneDateTime);

gs.print(convertedTimeZoneDateTime);