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use DateTime qw( ); use DateTime::TimeZone qw( ); ... say $dt->strftime("%FT%T%z"); }
2020-12-02T01:00:00+0100 ST 2020-12-02T01:00:00+0100 ST used in winter in Europe/Rome 2021-07-02T01:00:00+0100 ST 2021-07-02T02:00:00+0200 DT used in summer in Europe/Rome