Add Cardiff (United Kingdom) to your list and use my-locations table to visually convert it's time to another timezone or city time.
Mouse over the colored hour-tiles and glance at the hours selected by the column.

Current time zone for Cardiff (United Kingdom) is GMT, whose offset is GMT+0 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Cardiff, United Kingdom is "Europe/London"

It currently does not observe Daylight Savings Time.

DST ended on Sunday, October 29 2023 at 2:00 am local time, when time in Cardiff moved back 1 hour to 1:00 am.