About dark-at-5
A free tool that shows how dark it gets at 5 pm after the clocks fall back, for your ZIP.
Your ZIP stays in your browser.
The lookup and every calculation run on your device. We never put your ZIP in the web address, in analytics or in the share picture. If you let us, we remember your place on this device only, and “Forget this place” erases it.
Who makes it
plusbeauxjours makes small, free tools that answer one question clearly, with sources. No sign-up, no ads on this tool. See all our tools at plusbeauxjours.com (opens in a new tab), where you can also reach us.
Where the numbers come from
Sun times are computed with Astronomy Engine (MIT) and checked against the U.S. Naval Observatory. ZIP locations come from the US Census Gazetteer (public domain). Clock rules come from federal law and your browser's time-zone database. Details and every source: How it works.
Not affiliated with the U.S. Naval Observatory, NIST or the U.S. Congress.
Legal
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Sources checked . Page updated .