Function use_stopwatch 

pub fn use_stopwatch(
    started_at_ms: i64,
    ended_at_ms: Option<i64>,
) -> Signal<i64>

Stopwatch hook — counts up from a start time.

Returns a signal with the elapsed seconds. Ticks every second via wall-clock diff. Automatically stops ticking when ended_at_ms is provided.

Parameters

• started_at_ms: Epoch milliseconds when the stopwatch started.
• ended_at_ms: Epoch milliseconds when it ended (None = still running).

Example

let started = dioxus_nox_timer::time::now_ms(); // capture start time
let elapsed = use_stopwatch(started, None); // None = still running

rsx! {
    p { "Elapsed: {format_duration(*elapsed.read())}" }
}