Daylight Savings Time in the US

I wish the USG (US Federal Government) would pass legislation allowing states to decide whether or not to observe DST. There are a significant number of US States who have passed legislation to eliminate DST as soon as they are allowed to, and I for one would absolutely love not having my sleep schedule messed up twice a year.


I thought there was one state which didn’t observe it? I can’t remember which, though.


Who’s this lad at the bottom?

Apparently I remembered wrong. States only need approval from the DoT (dept. of Transportation, I think?), a Federal agency, to change observance of DST. In that case I wish more states would do that.

1 Like

Arizona, I think.

1 Like

Wikipedia says:

Arizona (apart from the Navajo Nation) and Hawaii do not use DST.


@RubyMineshaft Could you shift out this off-topic discussion please?

Thanks :3


It would probably be super complicated but you could try to convince someone to change that.

1 Like

For about 5 years already there is a push in the EU to abolish DST (also known as Summer Time). There have been delays in the process and the corona crisis is causing more delays, but perhaps it will happen in 2022.
What will happen is that countries will chose whether they will keep Summer Time or Winter Time for the whole year. Also see

Edit: Changed “Europe” to “EU”.


Do you mean “Europe” or “EU”? The two are not interchangeable.


States are allowed to not observe DST if they desire, and as noted, there are several which do. However, states must receive congressional authorization to permanently observe DST (that is, to “spring forward” and then never “fall back”) as this would be tantamount to altering their time zone, which falls under federal purview on grounds of interstate commerce.

Many arguments for abolishing DST center around moving to permanent DST, as this would provide for additional evening daylight, which connotes numerous positive benefits, including increased economic activity, a reduction in crime, and a reduction in suicide rates.


The situation in Arizona is even more complicated, with another nesting involving the Hopi Nation, which does not use DST and is entirely surrounded by the Navajo Nation.

To summarize:

  • USA: Uses DST
  • Arizona (within USA): Mostly does not use DST
  • Navajo Nation (mostly within Arizona): Uses DST
  • Hopi Nation (within Navajo Nation): Does not use DST


This is gold.

To be even more pedantic, one could imagine an interesting time zone and daylight savings journey in the straight-line path from Mesquite, Nevada to Jeddito, Arizona.

Actually, a typical drive would be even more interesting.


  1. How many times would you have to adjust a traditional wristwatch (not a smart watch that adjusts itself) to properly match the local time during such a drive?
  2. How does the answer change for taking the trip in December vs July?
  3. If your road trip is broken up into legs separated by several days (or months), what is the fewest watch time changes needed?
  4. What is the most watch changes that might be needed, provided that your entire journey does not take more than one year?

You don’t have to modify your sleep schedule if you don’t want to. You can maintain a 24h sleep cycle despite DST. During Standard Time, you wake up 1 hour before you “have to”. Try to do something useful during that hour (because you have one less evening hour before bedtime).


I’ve thought about trying that before.

1 Like

Alternative - do what I do and have an inconsistent enough sleep schedule that DST shifts are well within a standard deviation of average for you.


*Laughs in Saskatchewan.

1 Like

I’m disappointed that no one attempted to answer my pedantic time zone riddle. I won’t bother hiding this spoiler below, since the massiveness of this wall of text should be enough to dissuade most.

According to Google Maps, the drive from Mesquite, Nevada to Jeddito, Arizona, is about 337 miles (542 km) and would take under 6 hours to complete.

  1. Starting in Mesquite, Nevada, you are in the Pacific Time Zone, which observes DST. Hence, it is Pacific Standard Time (PST) at UTC-08:00 during the “winter” and Pacific Daylight Time (PDT) at UTC-07:00 during the “summer”.
  2. Quite soon into the drive, you would cross into the majority part of Arizona that does not observe DST and is also part of the different time zone, namely, Mountain Time. Year round, this part of Arizona is in Mountain Standard Time (MST) at UTC-07:00.
  3. Following the interstate for the fastest route takes you into Utah, which is still in the Mountain Time Zone, but does observe DST. During the “summer”, they are in Mountain Daylight Time (MDT) at UTC-06:00, while during the “winter”, they are in MST at UTC-07:00.
  4. You change highways and drive back into the main part of Arizona that is in MST at UTC-07:00 year round.
  5. As you continue your drive through Arizona, you eventually enter Navajo Nation, which does observe DST, and hence is in MDT at UTC-06:00 during the summer, and in MST at UTC-07:00 during the “winter”.
  6. The route through Navajo Nation takes you into an small exclave of the Hopi Nation, which is detached from the main part of the Hopi Nation. Both parts of the Hopi Nation are completely surrounded by the Navajo Nation. However, the Hopi Nation does not observe DST, and like the rest of Arizona outside of the Navajo Nation, they are in MST at UTC-07:00 year round.
  7. After a short drive through the Hopi Nation exclave, you are back in the Navajo Nation, which is in MDT at UTC-06:00 during the summer, and in MST at UTC-07:00 during the “winter”.
  8. The next transfer is back into the main part of the Hopi Nation, which is in MST at UTC-07:00 year round.
  9. Finally, after driving through the Hopi Nation for a bit, you will reach a part of the Navajo Nation that is an enclave within the Hopi Nation. This puts you back in a region that is in MDT at UTC-06:00 during the summer, and in MST at UTC-07:00 during the “winter”. This part of the Navajo Nation contains Jeddito, Arizona.

So there you have it. The drive involves crossing back and forth between several regions with distinct time zone and DST rules. Overall, there are nine distinct segments, with the potential for having to adjust you watch at each of the eight transitions.

However, how many times you adjust your depends on what time of year you make this drive, and whether the “summer” begins and/or ends during your drive.

If you complete the drive entirely within July, then the first of the eight transitions does not require a watch change, since you are going from PDT at UTC-07:00 to MST at UTC-07:00. However, at each of the remaining seven transitions you will have to adjust your watch as you switch between MST and MDT.

If you complete the drive entirely with December, you will only have to adjust your watch once, at the first transition from PST to MST, while in all of the remaining regions you stay within MST.

It is actually possible to complete the entire drive without adjusting your watch at all if you start your drive during the summer, which lets you make the first transition (from PDT to MST) without changing your watch, and then wait in the second region until the “winter” begins allowing you to complete the rest of the drive while remaining in MST.

You can maximize the number of watch adjustments, by beginning your drive in the “winter” in order to have to adjust your watch for the first transition, and then waiting in the second region for the “summer” to begin in order to also have to also adjust your watch for the remaining seven transitions. Finally, once you enter the last region, you can wait there before you reach Jeddito for the “summer” to end in Navajo Nation, in order to have to change your watch once more again. This makes for a maximum of nine total watch adjustments while completing the drive within one year.