# clock/clicks Return a high-resolution monotonic timestamp in nanoseconds. Unlike the other `clock/` primitives this value is not anchored to the epoch — it is only meaningful as a difference between two samples. Use it for elapsed-time and profiling measurements. ## Syntax 
[clock/clicks]
## Returns Integer nanoseconds from an arbitrary monotonic origin (number). ## Examples 
set start [clock/clicks]
# … do work …
set elapsed-ns ([clock/clicks] - $start)
echo "took" ($elapsed-ns / 1000000) "ms"
## Notes - The origin is unspecified and may differ between runs and processes. - Monotonic means the value never goes backwards, so it is safe for timing even across wall-clock adjustments. ## See Also `clock/seconds`, `clock/millis`, `clock/micros`
← clock/add
clock/format →