# V17 period note

- Timezone: `Asia/Tokyo`
- Period: `[2026-08-21 00:00, 2026-09-21 00:00)`
- Include the start instant and exclude the end instant.
- Expected included records: `B`, `C` (`120 + 180 = 300 seconds`).
- `A` and `D` are excluded by the two boundaries.
- `U` has an unknown date. Keep it in an `UNKNOWN` bucket; do not infer or zero-fill it.
- These are synthetic fixtures. Do not fetch or send user history.