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

The IANA timezone identifier for Groningen, Nederland is "Europe/Amsterdam"

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