Clock with Nanoseconds
A live clock that breaks the current time down to nanosecond-width digits using your browser's high-resolution timer, alongside your local time, UTC, and any timezone you choose.
This clock shows your system clock time broken down to nanosecond-width digits for readability. Consumer devices and browsers do not have verified nanosecond-accurate hardware clocks — the sub-microsecond digits are a display of the browser's high-resolution timer, not a certified measurement.
Tuesday, 2026-10-20
Search by city, country, or IANA identifier.
Saved timestamps
No saved timestamps yet. Use "Save current timestamp" above to keep one here.
About this tool
This clock combines your system clock (Date) with the browser's monotonic high-resolution timer (performance.now() and performance.timeOrigin) to display the current time with sub-millisecond digits that update smoothly, without the jumpiness of reading Date.now() on every frame.
The millisecond digits reflect your device's real clock precision. The microsecond and nanosecond digits are a readable breakdown of that same high-resolution number — see the notice above and the FAQ for what that does and doesn't guarantee.
How to use it
- Your local timezone is detected automatically and shown as "Your Local Time".
- UTC is always shown for reference.
- Use "Selected Timezone" to pick and search any IANA timezone (e.g. Asia/Karachi, America/New_York).
- Press "Save current timestamp" to keep a snapshot in the table below, or use the Copy buttons for the current value.
FAQ
Is this clock really accurate to the nanosecond?
No consumer browser or device has a certified, hardware-accurate nanosecond clock. This tool shows your system clock combined with the browser's high-resolution timer (performance.now()), broken into millisecond / microsecond / nanosecond digits for readability. Treat the millisecond digits as your device's real clock precision and the microsecond/nanosecond digits as a smooth display, not a verified measurement.
Why do the last few digits look "too smooth" or padded?
Most browsers intentionally limit performance.now() to somewhere between about 1 millisecond and 100 microseconds of real resolution (a security measure against timing attacks). Digits finer than that are computed from the same underlying number and will not reflect independent hardware measurement.
How is this different from "elapsed-time" precision?
System clock time (what this tool mainly shows) tells you the current date and time-of-day. High-resolution elapsed-time measurement (performance.now() deltas) is best for timing how long something takes, not for reading the current wall-clock time. This tool uses the high-resolution timer only to make the current-time display update smoothly.
Are my saved timestamps uploaded anywhere?
No. Saved timestamps are kept only in this browser's local storage. Nothing is sent to a server, and clearing your browser data removes them.
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