So if you travelled vertically within a timezone, you could end up going back and forth by an hour repeatedly, depending on the state’s decision made here?
Truly, a design made by committee.
So you can go back and forth by an hour within a single US state.
[0]The Navajo Nation extends into Utah and New Mexico, which observe DST, so this lets the Navajo Nation maintain a single time throughout.
quote:
"Consequently, the Commission proposes to discontinue the seasonal time changes in the Union, while ensuring that Member States retain the competence to decide on their standard time, in particular whether they will move to the standard time corresponding to their summer-time on a permanent basis or whether they will apply their current standard time permanently. "
https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELE...
Edited: clarified "This is actually incorrect" to "Note that the article is incorrect."
Hypothetically, if you start just north of Sittard and east of the German/Netherlands border (in Germany), and travel in a straight line, almost due south to Geneva in Switzerland, you could, depending on what time member states choose to permanently adopt, potentially go from German summertime, to Dutch wintertime, to Belgian summertime, to Luxembourgish wintertime, to French summertime, to Swiss wintertime, all in under 350 miles and with not much deviation in longitude.
But in this case we go to the general problem of choosing of timezones. You have plenty of cases of south borders with different timezones (ie. without moving in longitude you still switch zones).
It's a matter of country size, not to mention that it is a matter of economic interest to keep the same timezone as neighbouring countries. I would assume the scenario you mentioned to be quite unlikely.
Not sure how many people make daily border crossings between Spain/Portugal like those I described in my other comment, but even then it is something new if the time difference between states varies with the time of year.
In short, if your country opts out of summer time but your close neighbours don't, all those living in densely populated border areas are still affected by the summer time changes, only with the added complexity that your neighbours in the next suburb don't always keep the same time that you do...
In North America, for example, there are (admittedly not very populous) mountain time regions that are north of areas that observe both Alaska time, which is 2 hours behind, and Eastern time, which is 2 hours ahead.
If you want to complain about bouncing back-and-forth across a single time zone boundary by going north and south, as someone who's lived almost their entire life in various places along the Central/Eastern time border, all I can really offer is ¯\_(ツ)_/¯. Committee or not, it's gonna happen. Because there are so many reasons beyond simple longitude to pick a time zone.
That means you get 6 timezones for that latitude if you include the ocean.
There are a few more longitudes for which it works but not that much...
See: Arizona
(and most of Portugal is west of 7.5 degrees west so "should" be GMT-1... but really in any sane time zone scheme Portugal and Spain would have the same time.)
This is why people don't trust politicians - they don't understand the effects of their decisions (it _might_ be slightly more complicated than that.. but it's still).