Was the April expiration Friday a trading day?
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 2026-09-20, from Options Expiration Calendar 2026: All 12 Dates.
| year | april_expiry_label | regular_session_bars | session_status |
|---|---|---|---|
| 2016 | Apr 15 | 390 | full session |
| 2017 | Apr 21 | 390 | full session |
| 2018 | Apr 20 | 390 | full session |
| 2019 | Apr 19 | 0 | market closed |
| 2020 | Apr 17 | 390 | full session |
| 2021 | Apr 16 | 390 | full session |
| 2022 | Apr 15 | 0 | market closed |
| 2023 | Apr 21 | 390 | full session |
| 2024 | Apr 19 | 390 | full session |
| 2025 | Apr 18 | 0 | market closed |
| 2026 | Apr 17 | 390 | full session |
- Rows × columns
- 11 × 4
- 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 |
|---|---|---|---|
year |
text | 11 distinct values (2016, 2017, 2018…) | |
april_expiry_label |
text | 7 distinct values (Apr 15, Apr 16, Apr 17…) | |
regular_session_bars |
number | 0 to 390 | |
session_status |
text | 2 distinct values (full session, market closed) |
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
toString(toYear(cal.exp_date)) AS year,
concat(formatDateTime(cal.exp_date, '%b '), toString(toDayOfMonth(cal.exp_date))) AS april_expiry_label,
toUInt32(ifNull(tape.bars, 0)) AS regular_session_bars,
if(ifNull(tape.bars, 0) = 0, 'market closed', 'full session') AS session_status
FROM
(
SELECT
toDate(concat(toString(2016 + arrayJoin(range(11))), '-04-01')) AS april_first,
april_first + ((12 - toDayOfWeek(april_first)) % 7) + 14 AS exp_date
) AS cal
LEFT JOIN
(
SELECT
toDate(toTimeZone(window_start, 'America/New_York')) AS d,
count() AS bars
FROM global_markets.delayed_stocks_minute_aggs
WHERE ticker = 'SPY'
AND window_start >= toDateTime('2016-01-01 00:00:00')
AND toMonth(window_start) = 4
AND toDayOfMonth(window_start) BETWEEN 14 AND 22
AND (toHour(toTimeZone(window_start, 'America/New_York')) * 60
+ toMinute(toTimeZone(window_start, 'America/New_York'))) >= 570
AND (toHour(toTimeZone(window_start, 'America/New_York')) * 60
+ toMinute(toTimeZone(window_start, 'America/New_York'))) < 960
GROUP BY d
) AS tape ON tape.d = cal.exp_date
ORDER BY cal.exp_date