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Permanent daylight saving time, state by state: what your sunrise and sunset would actually be

Let a reader see, in their own state and in wall-clock terms, exactly what H.R. 139 would change about their winter mornings and evenings — instead of arguing about it in the abstract.

What Time Would The Sun Come Up In Your State?

Permanent daylight saving time, state by state: what your sunrise and sunset would actually be

Pick your state and a date. This computes sunrise and sunset for a representative city with the NOAA solar equations, then shows the same day on three clocks: permanent daylight saving time, permanent standard time, and the law as it stands today.

Uses: Your state · Which day

Example — adjust the inputs above for your situation

On December 21 in New York City, permanent daylight saving time would push sunrise from 7:16 a.m. to 8:16 a.m.

The sun comes up at the same moment either way. Under today's law this date is on standard time, so the clock reads 7:16 a.m. Under permanent daylight saving time the same sunrise reads 8:16 a.m., and sunset moves from 4:31 p.m. to 5:31 p.m. Daylight itself is unchanged at 9 hr 15 min.

Location used
New York City, New York
Date
December 21 (2027 reference year)
Sunrise under permanent daylight saving time
8:16 a.m.
Sunrise under permanent standard time
7:16 a.m.
Sunset under permanent daylight saving time
5:31 p.m.
Sunset under permanent standard time
4:31 p.m.
What your clock says on this date today
sunrise 7:16 a.m., sunset 4:31 p.m. — standard time
Hours of daylight (unchanged either way)
9 hr 15 min
  • ※ Permanent daylight saving time does not add daylight. It moves the label on the clock forward one hour, so mornings get darker and evenings get lighter by exactly the same amount.
  • ※ New York has not passed a year-round daylight saving law; under H.R. 139 it would be switched over unless it exempts itself before the act takes effect.
  • ※ Times are computed for the representative city shown, not for the whole state, and are good to about a minute or two.

How this is calculated

Sunrise and sunset are computed from scratch using the NOAA General Solar Position Calculations — the same equations behind NOAA's public solar calculator — for the representative city's latitude, longitude and standard-time UTC offset, with the usual 90.833° zenith that accounts for atmospheric refraction and the width of the solar disc. A fixed 2027 reference year keeps the result deterministic; sunrise on a given calendar date shifts by well under a minute from year to year. The three clock regimes are then pure labelling: permanent standard time is the computed local standard clock, permanent daylight saving time is that clock plus exactly 60 minutes, and today's law is standard time in winter and daylight saving time in summer. Nothing is estimated or modelled — the sun's position is astronomy, and the hour shift is arithmetic.

Data as of July 23, 2026 · verified July 23, 2026 · v1

Assumptions, limitations & sources

Assumptions

  • · Each state is represented by one city — usually its largest — so the figures describe that city, not every town in the state.
  • · Times use a 2027 reference year; a given calendar date's sunrise moves by well under a minute between years.
  • · Under today's law, the December, January and mid-November dates fall in standard time and the June date falls in daylight saving time.
  • · Hawaii and most of Arizona are treated as already on year-round standard time, which the House bill would let them keep.

Limitations

  • · The NOAA equations are accurate to roughly a minute at these latitudes; representative-city coordinates add a little more error. Treat the times as ±2 minutes, not to the second.
  • · Terrain is ignored. A city ringed by mountains sees the sun later than the flat-horizon calculation says.
  • · Fourteen of the states listed span more than one time zone; clocks in the other zone differ by an hour from the figures shown.
  • · This shows what the bill would do to the clock. It cannot tell you what that would do to sleep, school schedules, traffic safety or energy use — those are contested empirical questions, and the article covers where the evidence actually stands.
  • · H.R. 139 has passed only the House. Nothing here has taken effect, and the bill's own effective date depends on when, or whether, it is enacted.

Sources

This tool accompanies our reporting — read the full story for context.

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The story behind this tool

Politics

Permanent daylight saving time passed the House. Here is exactly what it would do to your state's sunrise

The House passed H.R. 139 on July 14 by 308–117, and 19 states already have year-round daylight saving laws waiting on Congress. The bill changes nothing about how much daylight you get — it changes when the clock says you get it. Pick your state and see the actual times.