Accuracy
How we stay right to the second.
Your local time
Detecting…
—
Checking against an authoritative time source…
We don't trust your device clock.
Computer clocks drift — often by seconds, sometimes minutes. On load we sample an authoritative UTC time source and measure the gap, so the time you see is the real time, not your laptop's guess.
Round-trip latency, removed.
Each sample records the network round trip and keeps the lowest-latency reading (an NTP-style trick), so the estimate isn't skewed by a slow request.
Always daylight-saving correct.
Offsets and DST transitions come straight from the IANA time-zone database built into your browser — the same data operating systems use — so a city is never an hour off after a clock change.
It keeps itself honest.
The clock re-syncs periodically and whenever you return to the tab, and shows you the live drift of your own device versus real time.