About Daylight Impact

Daylight Impact is a free TinyNeed tool that makes a policy argument concrete: instead of saying sunrise would be “one hour later,” it shows the clock times and everyday thresholds for a selected U.S. city.

What it calculates

The tool estimates sunrise and sunset from latitude, longitude, and date, then labels those solar events under current seasonal clock rules, permanent daylight time, and permanent standard time. It uses a representative 2027 calendar so all three scenarios can be compared across a full year.

What it does not do

This site does not predict whether H.R. 139 will become law, recommend a time policy, or replace an official clock or astronomical source. Local elevation, terrain, and atmospheric conditions can move an observed sunrise or sunset by several minutes.

Daylight Impact is not affiliated with Congress, the U.S. Department of Transportation, NOAA, or any state government.