Exact Time
The time to the second, in Paris and in UTC, corrected for your computer's offset, which the page measures live against our server.
How it measures: your browser asks /time-api.php for the time five times, keeps the exchange with the shortest round trip, then repeats every minute. No data is sent: all the computation happens in your browser.
Next daylight saving change
Sunday 25 October 2026: at 3:00 a.m. in Paris, clocks go back to 2:00 a.m.
EU rule (Directive 2000/84/EC): summer time starts on the last Sunday of March and ends on the last Sunday of October, at 01:00 UTC across the Union. The date is computed, not written by hand.
Where this time comes from
This page gets its time from our web server, which gets it from our NTP servers, which get it from public Stratum 1 servers, including the Paris Observatory's.
ntp-p1.obspm.fr, the Paris Observatory's Stratum 1, and other servers locked to a PPS signalReading of 15 October 2026 (chronyc sources on the web server, refid field of our servers). Our own GNSS Stratum 1 is a separate server that does not serve NTS: it is not in this page's chain.
How precise?
In a browser, the measurement goes over HTTPS, hence TCP and TLS, on a path whose outbound and return legs never take exactly the same time. The offset shown therefore carries a margin of half the round trip: around ten milliseconds on an ordinary connection, more over Wi-Fi or 4G. That is plenty to tell whether your clock is right, not enough to characterise an NTP server.
See also
The time spoken aloud, by phone, on +33 1 77 45 53 29. Check your machine's time
The NTP diagnostic: offset, latency, recommendations. Unix timestamp converter
Epoch ↔ date, and NTP timestamps.
Is your clock drifting? Why a PC loses time, and the commands to sync it with our servers.
Frequently asked questions
Where does the time shown on this page come from?
From our web server, which your browser queries several times to measure your clock's offset. That server synchronises over NTS with our Stratum 2 NTP servers, which themselves follow public Stratum 1 servers, including the Paris Observatory's, linked to UTC(OP). The page then corrects your computer's time by the measured offset.
Why does my computer's clock drift?
Because it ticks to a quartz crystal, whose frequency varies with manufacturing and temperature. An error of a few tens of millionths is enough to gain or lose several seconds a day. The operating system corrects it by querying an NTP server regularly; if it does not, or too rarely, the error builds up.
When is the next clock change?
In France and the rest of the EU: Sunday 25 October 2026: at 3:00 a.m. in Paris, clocks go back to 2:00 a.m. The EU rule (Directive 2000/84/EC) sets the start of summer time on the last Sunday of March and its end on the last Sunday of October, at 01:00 UTC across the Union.
Is the time shown atomic time?
It descends from it. International Atomic Time (TAI) is computed from laboratory atomic clocks; civil time, UTC, is derived from it and is currently 37 seconds behind. Stratum 1 servers take their time either from a GNSS receiver, derived from the atomic clocks carried on board GPS and Galileo satellites, or from a laboratory time scale such as UTC(OP). In France, legal time is realised by LNE-SYRTE at the Paris Observatory: we are not its source.
Free NTP Tools
Three independent tools to diagnose your time synchronization: