I've found another document from the European Commission that seems to say that the 2001 directive actually also requires that all EU member states use summer t

I've found another document from the European Commission that seems to say that the 2001 directive actually also requires that all EU member states use summer time, not only when if they use it. http://ec.europa.eu/transport/facts-fundings/studies/doc/2014-09-19-the-application-of-summertime-in-europe.pdf http://ec.europa.eu/transport/facts-fundings/studies/doc/201... "European policy measures began to be introduced, leading to the present day situation, where Directive 2000/84/EC requires Member States to put their clocks forward one hour on the last Sunday of March and change them back on the last Sunday of October each year." And 11.2 (page 10): "The cumulative effect of this succession of laws is that all Member States are now obliged to observe summertime, starting it on the last Sunday of March and ending it on the last Sunday of October."