The short list of clear “tried it → reversed it” cases is:
- 🇷🇺 Russia (2011–2014)
- 🇬🇧 United Kingdom (1968–1971)
- 🇺🇸 United States (1940s, 1970s experiments)
And the reason is remarkably consistent:
👉 Permanent DST sounds appealing—but winter mornings break it.