Clock settings
Atomic Clock (Device Time Display)
This atomic-style display reads your device clock. It does not connect to an atomic clock, NTP server, or official time service.
Time source and display method
The page creates a browser Date value from your device's system clock. It does not make a network request for time. If the device clock is early or late, this display is early or late by the same amount. NIST's time service is an example of an external official reference that this page does not use.
With milliseconds on, the page reads a new Date value during each animation frame and displays the millisecond field from 000 to 999. Those digits show the device-clock value at the moment the browser rendered the frame. They do not prove atomic accuracy or sub-millisecond measurement. With milliseconds off, updates align near second boundaries.
Freeze stops the visible updates and Resume returns to current device time. Rendering can pause or update less often in a background tab, during heavy device load, or while the device sleeps. The displayed time catches up when browser updates resume.
Sources: ECMAScript Date objects; NIST time.gov service.
Use the device-time display
Live follows the device clock. Freeze holds one displayed reading, and Snap returns to a fresh current value. Hide ms removes the millisecond field from view without changing the underlying time source.
Freeze at 14:08:31.245 to inspect that rendered value, then select Live to resume current readings. The page does not connect to an atomic clock, NTP service, or official time server.
Need a page focused directly on large millisecond digits? The clock with milliseconds shows local or UTC time with milliseconds as the main display while still relying on your browser and device clock. To compare millisecond-style displays across a few time zones, use the world clock with milliseconds.
Accuracy and limitations
This page displays atomic-style time using the clock provided by your device. It is not directly synchronized with an atomic clock, NTP server, or certified time service. Any difference in the device's system clock will also appear here.
Millisecond digits are refreshed by the browser. Display refresh, browser scheduling, background throttling, and device performance can affect how smoothly they appear without changing the page's underlying device-clock time source.
Maintained by Suhas Sunder. See how iLoveTimers is made.
Last reviewed .