I am always forgetting the polarity. Seeing the cut-overs listed helps me: $ zdump -v Europe/Berlin | grep 2021 Europe/Berlin Sun Mar 28 00:59:59 202

I am always forgetting the polarity. Seeing the cut-overs listed helps me: $ zdump -v Europe/Berlin | grep 2021 Europe/Berlin Sun Mar 28 00:59:59 2021 UT = Sun Mar 28 01:59:59 2021 CET isdst=0 gmtoff=3600 Europe/Berlin Sun Mar 28 01:00:00 2021 UT = Sun Mar 28 03:00:00 2021 CEST isdst=1 gmtoff=7200 Europe/Berlin Sun Oct 31 00:59:59 2021 UT = Sun Oct 31 02:59:59 2021 CEST isdst=1 gmtoff=7200 Europe/Berlin Sun Oct 31 01:00:00 2021 UT = Sun Oct 31 02:00:00 2021 CET isdst=0 gmtoff=3600