Public stopwatch data reference
Stopwatch Lap Data Sample
This page publishes a fixed, five-lap synthetic sample so developers, educators, and spreadsheet users can inspect a clear lap and split data shape without uploading a session or generating a personalized variant.
Field definitions
- lap
- A one-based lap number in recording order.
- lap_time
- The split duration since the previous lap, formatted as MM:SS.mmm.
- total_time
- The cumulative duration from the start, using the same fixed format.
Split and cumulative formulas
Each row is checked before it is serialized. For the first lap, the previous total is zero; subsequent rows use the preceding cumulative total.
lap_time = total_time - previous_total_timetotal_time = previous_total_time + lap_time- Totals must increase in recording order, and all durations are whole, non-negative milliseconds before display formatting.
Five-lap synthetic sample
The checked-in CSV and JSON files are generated from these same five rows. Values are deliberately synthetic and remain unchanged between builds.
| lap | lap_time | total_time |
|---|---|---|
| 1 | 00:12.340 | 00:12.340 |
| 2 | 00:08.750 | 00:21.090 |
| 3 | 00:15.500 | 00:36.590 |
| 4 | 00:09.125 | 00:45.715 |
| 5 | 00:11.285 | 00:57.000 |
Download the static sample
Both downloads are checked-in static site assets. The CSV uses the fields shown above; the JSON also labels the document as a synthetic sample and records its display format.
Export your own Stopwatch session
- 1. Open Stopwatch. Go to the live tool
- 2. Start timing. Use the Start control and keep the page open for the session.
- 3. Record laps. Press Lap whenever a split is needed, then pause when finished.
- 4. Export CSV. Choose Export CSV below the recorded laps.
Privacy and method limits
This reference page contains only the checked-in synthetic rows. It has no upload control, query-driven rows, identifiers, or personal session data. The live Stopwatch creates a personal CSV in your browser only when you choose its Export CSV control.
The sample demonstrates file shape and arithmetic, not a calibrated measurement. Real browser timing depends on the browser, device, scheduling, and display refresh, so this example is not a laboratory result or a safety-critical record.
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