And I doubt it's inexplicable, these things tend to have a long history of becoming more and more regular. The Netherlands were on GMT +19 minutes 32.12 second

And I doubt it's inexplicable, these things tend to have a long history of becoming more and more regular. The Netherlands were on GMT +19 minutes 32.12 seconds until 1937, so that noon in Amsterdam was exactly right. Then a lot of things happened and only since 1981 are we in sync with other western European countries.