Add Fredrikstad (Norway) 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 Fredrikstad (Norway) is CEST, whose offset is GMT+2 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Fredrikstad, Norway is "Europe/Oslo"

DST started on Sunday, March 30 2025 at 2:00 am local time, when time in Fredrikstad moved forward 1 hour to 3:00 am.
DST ends on Sunday, October 26 2025 at 3:00 am local time, when time in Fredrikstad moves back 1 hour to 2:00 am.