Add Guernsey (Guernsey) 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 Guernsey (Guernsey) is BST, whose offset is GMT+1 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Guernsey, Guernsey is "Europe/Guernsey"

DST ends on Sunday, October 26 2025 at 2:00 am local time, when time in Guernsey moves back 1 hour to 1:00 am.