This script applies to RARBG lists:
Note: there's a timestamp on the footer of each RARBG page e.g.
Mon, 02 Nov 2020 12:23:26 +0100.
Based on that, the script takes that for the server the UTC/UTC DST offsets are
+01:00 +01:00 (=no DST), therefore the timezone in the above case
+01:00 +01:00 (=no DST) ---> 'Etc/GMT-1';
+02:00 +02:00 (=no DST) ---> 'Etc/GMT-2';
It uses moment.js.
With the script: