France was put on to German time when conquered by Nazi Germany.
https://en.m.wikipedia.org/wiki/Time_in_France#History
In the summer of 1940, the German military authorities switched the occupied northern part of Metropolitan France to GMT+2 (German summer time),
The Vichy authorities … adopted GMT+2 (…German summer time) in May 1941 in order to unify the railway timetables
Spain put itself on to German time because Franco was a big fan of Hitler.
https://en.m.wikipedia.org/wiki/Time_in_Spain#History
In 1940, Francisco Franco changed the time zone[5] by changing 16 March 1940 23:00 Greenwich Mean Time to 17 March 1940 00:00 Central European Time during World War II. This was made permanent in 1942 in order to be in line with German-occupied Europe.[6]
https://www.theguardian.com/world/2013/sep/26/spain-working-hours-ending-siesta
In 1942, Spain’s dictator, General Francisco Franco, changed the country’s time zone to coincide with Germany’s in an act of solidarity with his fascist ally.
Belgium too.
https://robinfo.oma.be/en/astro-info/time/the-belgian-timezone-and-the-daylight-time-saving-system/
During the Second World War, all occupied territories, including Belgium, were required to adopt German time
Netherlands too.
https://en.m.wikipedia.org/wiki/Time_in_the_Netherlands#History
On 1 July 1937, the time zone of the Netherlands was simplified to UTC+00:20, and became generally known as “Dutch Time”. In 1940 when Germany occupied the Netherlands in World War II, Berlin Time (UTC+01:00) was adopted, and daylight saving time was removed. The Netherlands has retained UTC+01:00 ever since, today known as Central European Time.
You’re absolutely right. It’s so much more convenient your way, though; everytime I’m fortunate enough to spend a few days in your wonderful country (I’ll never get the beef between some of our fellow compatriots) I feel like I’m making the most of my days thanks to your schedule! Viva Portugal caralho!!