Online Tool Store
Daylight Hours Calculator
Calculate daylight length, sunrise, sunset, and solar noon in your local time, with day-over-day change and a month-by-month trend for the year.
This works right here on your device — nothing gets sent out.
Sunrise
Sunset
Solar noon
Daylight length
Daylight through the year at this location
Calculated offline using astronomical formulas — times are approximate (±1-2 minutes) and don't account for local timezone rules like daylight saving time beyond the fixed UTC offset entered above.
How it works
- Enter a latitude, longitude, and date, or use "Use my current location and timezone" to fill them in automatically.
- Set the UTC offset for the local time you want results shown in.
- Review sunrise, sunset, solar noon, and total daylight length, plus how much daylight changed from the previous day.
- Scroll to the year-round table to see how daylight length at this location shifts from month to month.
FAQ
How is daylight length calculated?
From latitude, longitude, and date using standard solar position equations — the equation of time and solar declination — the same NOAA-derived formulas used by this site's Sunrise Sunset Lookup tool, verified against published sunrise/sunset reference times.
Why enter a UTC offset instead of picking a timezone by name?
Timezone boundaries follow political borders, not longitude, so converting coordinates to a named timezone needs a separate lookup dataset. A UTC offset is precise and lets you see results in your own local time — "Use my current location and timezone" fills it in automatically from your browser.
What does the change vs. previous day figure mean?
How many minutes and seconds of daylight were gained or lost compared to the day before. This changes fastest around the spring and fall equinoxes (several minutes a day) and levels off to nearly zero at the summer and winter solstices — the turning points of the year.
What happens at very high latitudes?
Near the Arctic and Antarctic Circles, the calculator correctly shows "24 hours (midnight sun)" for polar day and "no sunrise/no sunset" for polar night, when the sun never sets or never rises on that date.
How accurate are the results?
Within about ±1-2 minutes of published values for sunrise and sunset. They don't account for elevation, unusual atmospheric conditions, or daylight saving time changes beyond the fixed UTC offset you enter.
How we compare
| Feature | Online Tool Store | RapidToolSet Daylight Hours Calculator | Calcipedia Day Length Calculator |
|---|---|---|---|
| Sunrise, sunset, and solar noon | Yes | Yes | Not shown |
| Results in your local time (UTC offset) | Yes | Yes | Not shown |
| Day-over-day daylight change | Yes | Not shown | Yes |
| Month-by-month trend for the year | Yes | Not shown | Not shown |
| No account, runs in your browser | Yes | Yes | Yes |
For seeing not just today's daylight figure but where the whole year is headed at a glance, the month-by-month table adds a view neither of these single-date lookups offers.