Sunset Time Calculator: Find the Exact Clock Time for Your Location

Why sunset times vary by place and date

Sunset timing is the result of four interacting factors: where you are on Earth (longitude and latitude), the time standard you use (your time zone), and how high you are above sea level (altitude). In addition, the Sun’s apparent motion through the sky isn’t perfectly uniform across the year, a discrepancy measured by the Equation of Time. Taken together, these factors explain why the same date can yield different sunset times from city to city and why sunset shifts from day to day.

Longitudinal position matters because the Sun travels roughly 4 minutes of clock time for every degree you move east or west. Time zones are political constructs that don’t align perfectly with raw solar time, so places within the same zone can still see different clock times for sunset. Latitude changes how much the Sun’s daily path swings north and south across the year, producing larger seasonal differences at higher latitudes. Elevation adds another, smaller effect: roughly 1 minute of difference per 1,000 feet of altitude.

Over the year, the two main effects—the geometry of the Sun’s path (the declination-driven change in daylight) and the clock-based difference between Sun time and mean solar time—combine so that earliest sunset and latest sunrise do not occur on the solstice dates exactly. The “clock effect” shifts all Sun events together, while the “geometric effect” shifts sunrise and sunset in opposite directions. The result is a characteristic pattern that varies by latitude and season.

Twilight and why it matters for planning

Beyond sunset itself, photographers and outdoor planners often care about twilight—those periods when the sky is not fully dark or fully light. Twilight is categorized into three phases: civil twilight, nautical twilight, and astronomical twilight. Civil twilight occurs when there is enough daylight to see without artificial lighting; nautical twilight is when the horizon is still visible at sea; astronomical twilight is when the sky is dark enough for most astronomical observations but faint light may still be present. Knowing these definitions helps you plan the moments just before or after sunset for the best lighting, without guessing when darkness will arrive.

Rules you can use at a glance (quick reference)

To estimate how much later or earlier a given sunrise or sunset will be on a nearby day, you can rely on a few simple rules of thumb. For longitude, think about roughly 4 minutes of clock time per degree of longitude as you move east to west. Elevation tends to advance sunrise by about 1 minute for every 1,000 feet of elevation gained, with a similar small delay for sunset. Near the equinoxes, day-to-day changes can be up to about 3 minutes, while the magnitude of the daily change in sunset time grows or shrinks with the Sun’s declination. These guidelines provide a practical sense of when and how much to expect shifts, without needing a calculator for every forecast.

In practical terms, that means you can estimate, for example, how much sunset time will shift from one day to the next, or how much earlier sunset will be in a higher-elevation city. It is a convenient supplement to the precise times you obtain from dedicated calculators.

Real-world examples to illustrate the concept

Concrete numbers help ground the concepts. For instance, at 40°N, on December 8 the earliest sunset occurs around 4:30 PM. In Charleston, South Carolina (about 32.8°N), the earliest sunset is around 5:13 PM Eastern Standard Time. In Boston, Massachusetts (about 42.4°N), the earliest sunset is around 4:15 PM EST. Anchorage, Alaska, has the latest clock-time sunrise in late December, around 10:15 AM. These examples show how latitude, the time zone, and the date interact in real locations.

Using calculators and practical steps

For precise sunset times, use solar calculators such as NOAA and USNO workflows, which take your location and date and output the exact clock time. A practical step-by-step approach is:

1) Find your latitude and longitude using any free mapping service. 2) Determine your local time zone offset. 3) Input these values and the date into NOAA’s solar position calculator. 4) If you are above 1,000 feet, adjust the result by roughly 1 minute earlier per 1,000 feet of elevation for sunrise and sunset. 5) For quick comparison, you can also check Almanac’s sunrise/sunset tools, which incorporate these factors automatically by ZIP code.

Golden hour and photography planning

The “golden hour” is the period shortly before sunset (and after sunrise) when daylight is soft and warm. Once you have a calculated sunset time, you can plan the golden hour window by counting backward from sunset. Photographers and videographers often rely on this window to maximize favorable lighting. Time of day matters because the golden hour shifts with the Sun’s path; the exact window depends on your latitude and date.

Daylight Saving Time and clock changes

Daylight Saving Time introduces an annual clock shift. Clocks move forward by one hour in spring and back by one hour in fall. The clock-change moment is commonly cited as 2:00 AM local time in most of the United States, though local rules can vary in other regions. For planning, remember that the actual solar events (sunrise and sunset) do not move with the clock when DST starts or ends—the clock time does. The change can affect how early or late you perceive daylight, and it is a frequent source of confusion during the transition period.

Sunset time lookup tool (on-site)

Use this lightweight lookup to get guidance on sunset times for today by location. For exact times, an authoritative calculator is recommended, and you’ll be directed to a reputable external tool if needed.

// Lightweight, safety-conscious lookup helper.
// This does not compute times on-site. It guides users to an authoritative tool.
(function() {
var btn = document.getElementById(‘lookup-btn’);
var input = document.getElementById(‘lookup-location’);
var result = document.getElementById(‘sunset-result’);
btn.addEventListener(‘click’, function() {
var q = (input.value || ”).trim();
if (!q) {
alert(‘Please enter a city or ZIP code to look up sunset time.’);
return;
}
// Open an external, reputable sunset calculator in a new tab.
// The external tool will provide the exact time for the location today.
var externalUrl = ‘https://www.timeanddate.com/sunrise/?query=’ + encodeURIComponent(q);
window.open(externalUrl, ‘_blank’, ‘noopener’);
result.innerHTML = ‘Opened external sunset calculator for “‘ + q + ‘”. The exact sunset time for today will be shown there.’;
});
})();

Frequently Asked Questions

Do we gain or lose an hour during Daylight Saving Time? When Daylight Saving Time starts in spring, clocks are moved forward and an hour is lost. When it ends in fall, clocks are set back and an hour is gained.

What time do the clocks change? Clocks change at 2:00 A.M. local time in most of the United States, a time when people are rarely actively working or conducting business.

Will my phone change automatically for Daylight Saving Time? Most smartphones, computers, and connected devices update automatically if they are set to adjust date, time, and time zone. Some appliances, cars, or wall clocks may require manual adjustment.

Does Canada change clocks on the same day as the United States? Some parts of Canada follow the U.S. schedule, but provinces and territories govern their own rules. Several regions stopped changing clocks in 2026; for example, British Columbia, Alberta, Manitoba, and the Northwest Territories will not turn clocks back on November 1, 2026. Yukon and Saskatchewan observe one time year-round. Other parts of Canada, including most of Ontario and Quebec and the Atlantic provinces, continue seasonal time changes.

Sources

1. U.S. Navy Office — Daylight Saving Time
2. U.S. Department of Transportation — Daylight Saving Time
3. U.S. Library of Congress — Daylight Saving Time (DST)
4. U.S. Department of Transportation — Uniform Time
5. National Institute of Standards and Technology (NIST) — Daylight Saving Time Rules

Notes on accuracy and planning

The information here is designed to help you understand what drives sunset timing and how to plan around it. For exact times on a given date and location, use a trusted calculator or an embeddable tool that returns today’s sunset time for your place. When using any health or circadian-related guidance, rely on clearly attributed expert sources and organizations for the most credible, up-to-date recommendations.