About Hourmatch
Hourmatch answers one question quickly: when are all of us awake and at work at the same time? Add the places you care about, slide the tape, and share the link.
How the data works
There is no time zone database in this app. Every conversion uses the one already built into
your browser through the standard Intl APIs, which ship the IANA time zone rules and
are updated with your browser. Daylight saving transitions, half-hour and quarter-hour offsets all
come from there.
Privacy
The site is a set of static files. It sets no cookies, loads no third-party scripts, fonts or analytics, and never sends what you type anywhere. The URL is the only state; your browser keeps a copy of your last board locally so the tool opens where you left it.
Open source
The code lives at github.com/hourmatch/app. Found a wrong offset? File an issue with the zones and the date.