session_clock
Answered against 22 years of US equities and 12 years of US options data and published with the query that produced it. This result is stored as of 2026-09-30, from spy-dividend-for-korean-investors.
| et_time | kst_clock | volume_millions |
|---|---|---|
| 08:00 | Fri Sep 18 21:00 | 0.16 |
| 08:30 | Fri Sep 18 21:30 | 0.09 |
| 09:00 | Fri Sep 18 22:00 | 0.33 |
| 09:30 | Fri Sep 18 22:30 | 5.26 |
| 10:00 | Fri Sep 18 23:00 | 3.16 |
| 10:30 | Fri Sep 18 23:30 | 2.09 |
| 11:00 | Sat Sep 19 00:00 | 18.33 |
| 11:30 | Sat Sep 19 00:30 | 1.68 |
| 12:00 | Sat Sep 19 01:00 | 2.18 |
| 12:30 | Sat Sep 19 01:30 | 1.19 |
| 13:00 | Sat Sep 19 02:00 | 5.31 |
| 13:30 | Sat Sep 19 02:30 | 1.14 |
| 14:00 | Sat Sep 19 03:00 | 1.85 |
| 14:30 | Sat Sep 19 03:30 | 1.98 |
| 15:00 | Sat Sep 19 04:00 | 1.7 |
| 15:30 | Sat Sep 19 04:30 | 8.48 |
| 16:00 | Sat Sep 19 05:00 | 6.15 |
| 16:30 | Sat Sep 19 05:30 | 0.4 |
- Rows × columns
- 18 × 3
- Computed
- Completeness
- No missing values
- Source
- US exchange, SIP and OPRA market data
- Licence
- Strasmore terms · free, no signup
What each column holds
| Column | Type | Range | Notes |
|---|---|---|---|
et_time |
text | 18 distinct values (08:00, 08:30, 09:00…) | |
kst_clock |
text | 18 distinct values | |
volume_millions |
number | 0.09 to 18.33 | count |
Computed from Strasmore's warehouse of US exchange, SIP and OPRA market data. Equity prices are delayed; options greeks and implied volatility are end-of-day. This result is stored, not recomputed on load — it is exactly the numbers that were returned on , and the query below is what returned them.
Run it yourself
This is the exact query behind the result above. Change a ticker, a date or a column and run it against the warehouse — no account, no key. The no-signup tier is smaller than the one this page was computed on; a query that reaches past it comes back saying which plan runs it.
SELECT
formatDateTime(toTimeZone(bucket, 'America/New_York'), '%H:%i') AS et_time,
formatDateTime(toTimeZone(bucket, 'Asia/Seoul'), '%a %b %e %H:%i') AS kst_clock,
round(toFloat64(sum(volume)) / 1000000, 2) AS volume_millions
FROM
(
SELECT
toStartOfInterval(window_start, INTERVAL 30 MINUTE) AS bucket,
volume
FROM global_markets.delayed_stocks_minute_aggs
WHERE ticker = 'SPY'
AND window_start >= '2026-09-18 12:00:00'
AND window_start < '2026-09-18 21:00:00'
)
GROUP BY bucket
ORDER BY bucket
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